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Richard Feynman
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Richard Feynman

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Richard Feynman

Richard Feynman

Richard Phillips Feynman ( ; May 11, 1918 – February 15, 1988) was an American theoretical physicist. He shared the 1965 Nobel Prize in Physics with Julian…

Richard Phillips Feynman (; May 11, 1918 – February 15, 1988) was a distinguished American theoretical physicist. In 1965, he was a co-recipient of the Nobel Prize in Physics, alongside Julian Schwinger and Shin'ichirō Tomonaga, recognized "for their fundamental work in quantum electrodynamics (QED), which had profound implications for the physics of elementary particles." His contributions also encompassed the path integral formulation of quantum mechanics, the theoretical understanding of superfluidity in supercooled liquid helium, and the development of the parton model. Furthermore, Feynman devised a graphical representation system for the mathematical expressions that characterize subatomic particle behavior; this system, subsequently termed Feynman diagrams, is now extensively employed.

Richard Phillips Feynman (; May 11, 1918 – February 15, 1988) was an American theoretical physicist. He shared the 1965 Nobel Prize in Physics with Julian Schwinger and Shin'ichirō Tomonaga "for their fundamental work in quantum electrodynamics (QED), with deep-ploughing consequences for the physics of elementary particles". He is also known for his work in the path integral formulation of quantum mechanics, the theory of the physics of the superfluidity of supercooled liquid helium, and the parton model. Feynman developed a pictorial representation scheme for the mathematical expressions describing the behavior of subatomic particles, which later became known as Feynman diagrams and is widely used.

During World War II, he participated in the atomic bomb's development, and in the 1980s, he gained broader public recognition as a member of the Rogers Commission, the investigative panel for the Space Shuttle Challenger disaster. Beyond his theoretical physics endeavors, Feynman is credited with pioneering the field of quantum computing and introducing the concept of nanotechnology. He occupied the Richard C. Tolman professorship in theoretical physics at the California Institute of Technology. A 1999 global survey conducted by the British journal Physics World, involving 130 prominent physicists, ranked him as the seventh-greatest physicist in history.

Feynman actively popularized physics through various books and lectures, notably his 1959 talk on top-down nanotechnology, "There's Plenty of Room at the Bottom," and his undergraduate lecture series, The Feynman Lectures on Physics (1961–1964). Lectures intended for general audiences were also delivered by him, subsequently documented in The Character of Physical Law (1965) and QED: The Strange Theory of Light and Matter (1985). His public persona was further enhanced by Ralph Leighton's compilations of his anecdotes, including Surely You're Joking, Mr. Feynman! (1985) and What Do You Care What Other People Think? (1988). Leighton also chronicled Feynman's aspiration to travel to Tannu Tuva in Tuva or Bust!. Numerous biographies have been written about him, commencing with James Gleick's Genius: The Life and Science of Richard Feynman.

Early Life

Richard Feynman was born in New York City on May 11, 1918, to Lucille (née Phillips), a homemaker, and Melville Arthur Feynman, a sales manager. His father, born into a Jewish family in Minsk, Russian Empire, immigrated to the United States with his parents at the age of five. His mother, also from a Jewish family, was born in the United States. Lucille's father had emigrated from Poland, and her mother's family similarly originated from Polish immigrants. Although trained as a primary school teacher, she married Melville in 1917 prior to commencing her professional career. Richard exhibited delayed speech development, not speaking until after his third birthday. In adulthood, his pronounced New York accent was often perceived as an affectation or exaggeration, leading his colleagues Wolfgang Pauli and Hans Bethe to remark that Feynman spoke like a "bum."

Young Feynman's intellectual development was significantly shaped by his father, who fostered a questioning attitude towards conventional thought and consistently introduced him to new concepts. His mother instilled in him the lifelong sense of humor for which he became known. During his childhood, he demonstrated an aptitude for engineering, establishing an experimental laboratory at home and finding enjoyment in radio repair. This radio repair work, likely Feynman's initial employment, revealed early indications of his future proficiency in theoretical physics, as he approached problems with theoretical analysis to derive solutions. While in grade school, he engineered a home burglar alarm system during his parents' absence for errands.

At the age of five, Richard's mother gave birth to his younger brother, Henry Phillips, who tragically died at four weeks old. Four years subsequently, his sister Joan was born, and the family relocated to Far Rockaway, Queens. Despite a nine-year age difference, Joan and Richard maintained a close relationship, both exhibiting a shared curiosity about the world. Notwithstanding their mother's belief that women lacked the capacity for such understanding, Richard fostered Joan's interest in astronomy, even taking her to observe the aurora borealis in Far Rockaway. Later, as an astrophysicist, Joan would contribute to explaining the phenomena causing the northern lights.

Religion

Richard Feynman's parents were of Jewish descent, and his family observed weekly synagogue attendance. Nevertheless, by his adolescence, Feynman identified as an avowed atheist. Decades later, in a correspondence to Tina Levitan, where he declined to provide information for her publication on Jewish Nobel laureates, Feynman articulated his perspective: "To select, for approbation the peculiar elements that come from some supposedly Jewish heredity is to open the door to all kinds of nonsense on racial theory." He further elaborated, stating that "at thirteen I was not only converted to other religious views, but I also stopped believing that the Jewish people are in any way 'the chosen people'."

Subsequently, during a He observed its structure, noting the original text presented in a small central square on each page, encircled by commentaries accumulated over time from various scholars. This arrangement demonstrated the Talmud's evolutionary development, with all discussions meticulously documented. Although impressed by its methodology, Feynman expressed disappointment regarding the rabbis' apparent disinterest in the natural world and external phenomena, as their focus remained exclusively on questions derived from the Talmud.

Education

Feynman matriculated at Far Rockaway High School, an institution also attended by future Nobel laureates Burton Richter and Baruch Samuel Blumberg. Early in his high school tenure, Feynman received an accelerated placement into an advanced mathematics course. A high school IQ assessment indicated a score of 125, which, while elevated, was characterized as "merely respectable" by biographer James Gleick. His sister, Joan, whose score was marginally higher, later humorously asserted her intellectual superiority to an interviewer. Subsequently, he declined an invitation to join Mensa International, citing his IQ as insufficient for membership.

By the age of 15, Feynman had independently mastered trigonometry, advanced algebra, infinite series, analytic geometry, and both differential and integral calculus. Prior to his collegiate enrollment, he engaged in experimental exploration of mathematical concepts, including the half-derivative, employing a self-devised notation system. He devised unique symbols for logarithmic, sine, cosine, and tangent functions to prevent their misinterpretation as products of three variables. Additionally, he formulated a distinct notation for the derivative, aiming to mitigate the common error of canceling the d {\displaystyle d} s within d / d x {\displaystyle d/dx} . As a member of the Arista Honor Society, he secured victory in the New York University Math Championship during his final year of high school. His propensity for direct and unconventional inquiry occasionally disconcerted more traditional academics; for instance, during a lesson on feline anatomy, he famously inquired, "Do you have a map of the cat?" (referring to an anatomical chart).

Feynman's application to Columbia University was unsuccessful, reportedly due to the institution's quota on Jewish admissions at the time. Consequently, he enrolled at the Massachusetts Institute of Technology, becoming a member of the Pi Lambda Phi fraternity. Initially pursuing a major in mathematics, he subsequently transitioned to electrical engineering, perceiving mathematics as excessively abstract. Recognizing this shift as an overcorrection, he then opted for physics, which he characterized as an intermediate discipline. During his undergraduate studies, he authored two publications in the esteemed journal Physical Review. One of these, co-authored with Manuel Vallarta, bore the title "The Scattering of Cosmic Rays by the Stars of a Galaxy".

Vallarta imparted to his student a convention of mentor-protégé publishing: the senior scientist's name typically precedes the junior author's. Feynman experienced a form of vindication years later when Werner Heisenberg concluded a comprehensive treatise on cosmic rays with the statement: "such an effect is not to be expected according to Vallarta and Feynman." Upon their subsequent encounter, Feynman jovially inquired whether Vallarta had reviewed Heisenberg's publication. Vallarta, understanding Feynman's amusement, responded, "Yes. You're the last word in cosmic rays."

The second publication originated from his senior thesis, titled "Forces in Molecules," a subject proposed by John C. Slater. Slater was notably impressed by the work, leading to its publication. The principal finding of this thesis is now recognized as the Hellmann–Feynman theorem.

In 1939, Feynman earned a bachelor's degree and was recognized as a Putnam Fellow. He achieved an unprecedented perfect score on the Princeton University graduate school entrance examination in physics, alongside an exceptional performance in mathematics, though his scores in history and English were notably low. Henry D. Smyth, the head of the physics department, expressed a different concern, inquiring of Philip M. Morse: "Is Feynman Jewish? While we have no explicit policy against Jewish individuals, we must maintain a reasonably low proportion within our department due to challenges in their placement." Morse confirmed Feynman's Jewish heritage but assured Smyth that Feynman's "physiognomy and manner, however, show no trace of this characteristic."

Feynman's inaugural seminar, which focused on the classical formulation of the Wheeler–Feynman absorber theory, attracted notable attendees such as Albert Einstein, Wolfgang Pauli, and John von Neumann. Pauli astutely remarked on the significant challenge of quantizing the theory, while Einstein suggested its potential application to gravity within general relativity, a concept later explored by Sir Fred Hoyle and Jayant Narlikar in their Hoyle–Narlikar theory of gravity. Feynman earned his Ph.D. from Princeton in 1942, under the advisement of John Archibald Wheeler. His doctoral thesis, "The Principle of Least Action in Quantum Mechanics," applied the principle of stationary action to quantum mechanics problems. This work was motivated by the ambition to quantize the Wheeler–Feynman absorber theory of electrodynamics and established foundational concepts for the path integral formulation and Feynman diagrams. A crucial insight from his research was the observation that positrons exhibit behavior analogous to electrons traversing backward in time. James Gleick observed:

"This was Richard Feynman nearing the crest of his powers. At twenty-three ... there may now have been no physicist on earth who could match his exuberant command over the native materials of theoretical science. It was not just a facility at mathematics (though it had become clear ... that the mathematical machinery emerging in the Wheeler–Feynman collaboration was beyond Wheeler's own ability). Feynman seemed to possess a frightening ease with the substance behind the equations, like Einstein at the same age, like the Soviet physicist Lev Landau—but few others."

A stipulation of Feynman's Princeton scholarship prohibited marriage; however, he maintained his relationship with his high school sweetheart, Arline Greenbaum, and resolved to marry her upon completing his Ph.D., despite her severe illness with tuberculosis. Tuberculosis was incurable at that time, and her life expectancy was estimated at less than two years. On June 29, 1942, they traveled by ferry to Staten Island and were married in a municipal office. The ceremony lacked family or friends and was witnessed solely by two strangers. Feynman was only able to kiss Arline on her cheek. Following the ceremony, he transported her to Deborah Hospital, where he subsequently visited her on weekends.

Manhattan Project

In 1941, while World War II was underway in Europe but prior to the United States' entry into the conflict, Feynman spent the summer addressing ballistics problems at the Frankford Arsenal in Pennsylvania. Following the attack on Pearl Harbor, which drew the United States into the war, Feynman was recruited by Robert R. Wilson. Wilson was developing methods for producing enriched uranium for an atomic bomb, a project that would evolve into the Manhattan Project. At this juncture, Feynman had not yet completed his graduate degree. Wilson's team at Princeton was engaged in the development of a device known as an isotron, designed for the electromagnetic separation of uranium-235 from uranium-238. This approach differed significantly from the calutron, which was being developed by a team led by Wilson's former mentor, Ernest O. Lawrence, at the University of California's Radiation Laboratory. Theoretically, the isotron offered significantly greater efficiency than the calutron; however, Feynman and Paul Olum encountered difficulties in assessing its practical feasibility. Ultimately, the isotron project was discontinued based on Lawrence's recommendation.

In early 1943, Robert Oppenheimer initiated the establishment of the Los Alamos Laboratory, a clandestine facility situated on a New Mexico mesa, purposed for the design and construction of atomic bombs. The Princeton team received an invitation to relocate to this new site. Wilson later recounted their collective decision, stating, "Like a bunch of professional soldiers, we signed up, en masse, to go to Los Alamos." Oppenheimer actively recruited numerous young physicists, including Feynman, whom he contacted by telephone from Chicago to inform about securing a Presbyterian sanatorium in Albuquerque, New Mexico, for Arline. Feynman and Arline were among the initial group to depart for New Mexico, embarking on a train on March 28, 1943. The railway provided Arline with a wheelchair, and Feynman incurred additional costs for a private room for her, where they subsequently observed their wedding anniversary.

At Los Alamos, Feynman was assigned to Hans Bethe's Theoretical (T) Division, where his contributions quickly led to his promotion to group leader. Collaborating with Bethe, he co-developed the Bethe–Feynman formula, a method for calculating the yield of a fission bomb, which expanded upon earlier research by Robert Serber. Despite his junior status, Feynman's role was not peripheral; he managed the computation group within the theoretical division, overseeing human computers. Alongside Stanley Frankel and Nicholas Metropolis, he helped implement a system for computational tasks utilizing IBM punched cards. Feynman also devised an innovative method for computing logarithms, which he later applied to the Connection Machine. Demonstrating his diverse interests, the avid drummer even configured the machine to produce musical rhythms. His other responsibilities at Los Alamos involved calculating neutron equations for the "Water Boiler," a compact nuclear reactor, to assess the proximity of fissile material assemblies to criticality. Following the completion of this assignment, Feynman was dispatched to the Clinton Engineer Works in Oak Ridge, Tennessee, home to the Manhattan Project's uranium enrichment facilities. There, he assisted engineers in formulating safety protocols for material storage, aiming to prevent criticality accidents, particularly when enriched uranium interacted with water, which functions as a neutron moderator. Feynman advocated for educating all personnel on nuclear physics to ensure their comprehension of the inherent risks. He clarified that while unenriched uranium could be stored without significant hazard, enriched uranium necessitated meticulous handling. Consequently, he formulated a comprehensive set of safety recommendations tailored to different enrichment grades. He was instructed that any resistance to his proposals at Oak Ridge should be met with the assertion that Los Alamos "could not be responsible for their safety otherwise."

Upon his return to Los Alamos, Feynman assumed leadership of the group tasked with theoretical work and calculations concerning the proposed uranium hydride bomb, a concept that ultimately proved unfeasible. He became a frequent discussion partner for physicist Niels Bohr, engaging in one-on-one conversations. Feynman later ascertained the reason for Bohr's preference: most other physicists were too intimidated by Bohr to challenge his ideas. In contrast, Feynman exhibited no such reservations, assertively highlighting any aspects he perceived as flawed in Bohr's reasoning. He stated that while he held Bohr in high regard, his intense focus during physics discussions often led him to disregard social conventions. This directness may have contributed to Bohr's apparent lack of personal warmth towards Feynman. Nevertheless, Feynman made a strong impression on Oppenheimer, who, in a November 1943 letter to Raymond T. Birge, chairman of the University of California's physics department, described Feynman as "by all odds the most brilliant young physicist here, and everyone knows this."

Within the security-isolated environment of Los Alamos, Feynman found amusement in examining the combination locks on physicists' cabinets and desks. He frequently discovered that these locks retained their factory default settings, or that combinations were either explicitly recorded or easily deducible, such as dates. For instance, he successfully deduced one cabinet's combination by experimenting with numbers he anticipated a physicist might employ (which turned out to be 27–18–28, referencing the base of natural logarithms, e = 2.71828 ...). Furthermore, he observed that a colleague's three filing cabinets, containing research notes, all shared an identical combination. As a practical joke, Feynman placed notes inside these cabinets, leading his colleague, Frederic de Hoffmann, to mistakenly believe that a spy had compromised their security.

Feynman's monthly salary, amounting to $380 (equivalent to $7,000 in 2025), covered approximately half of his modest living expenses and Arline's medical expenditures, necessitating reliance on her $3,300 (equivalent to $61,000 in 2025) in savings. On weekends, he would borrow a car from his colleague Klaus Fuchs to When questioned about potential spies at Los Alamos, Fuchs cited Feynman's safe-cracking activities and frequent trips to Albuquerque; Fuchs himself subsequently confessed to espionage for the Soviet Union. The Federal Bureau of Investigation (FBI) consequently amassed a substantial dossier on Feynman, particularly given his Q clearance.

Upon learning of Arline's terminal condition, Feynman traveled to Albuquerque and remained with her for several hours until her death on June 16, 1945. Subsequently, he dedicated himself intensely to the project and was present at the Trinity nuclear test. Feynman asserted that he was the sole individual to observe the explosion without the provided dark glasses or welder's lenses, rationalizing that viewing it through a truck windshield would safely filter out harmful ultraviolet radiation. The explosion's immense luminosity compelled him to duck to the truck's floor, where he perceived a transient "purple splotch" as an afterimage.

Tenure at Cornell (1945–1949)

Feynman formally held an assistant professorship in physics at the University of Wisconsin–Madison, though he was on unpaid leave during his involvement with the Manhattan Project. In 1945, Dean Mark Ingraham of the College of Letters and Science sent him a letter requesting his return to teach in the upcoming academic year. His appointment was not renewed when he failed to commit to returning. Several years later, during a talk at the university, Feynman humorously remarked, "It's great to be back at the only university that ever had the good sense to fire me."

As early as October 30, 1943, Bethe had recommended Feynman for a faculty position to the chairman of the physics department at Cornell University. This recommendation was further endorsed on February 28, 1944, by Robert Bacher, also from Cornell and a senior scientist at Los Alamos. Consequently, an offer was extended in August 1944, which Feynman accepted. Although Oppenheimer had sought to recruit Feynman to the University of California, Birge expressed reluctance. Birge made Feynman an offer in May 1945, which Feynman declined. Cornell subsequently matched its initial salary offer of $3,900 (equivalent to $70,000 in 2025) per annum. Feynman became one of the initial group leaders from the Los Alamos Laboratory to depart, relocating to Ithaca, New York, in October 1945.

With his departure from the Los Alamos Laboratory, Feynman lost his draft exemption. During his induction physical, Army psychiatrists diagnosed him with a mental illness, resulting in a 4-F exemption on mental health grounds. His father's sudden death on October 8, 1946, precipitated a period of depression for Feynman. On October 17, 1946, he composed a letter to Arline, articulating his profound love and sorrow. The letter remained sealed and was only opened posthumously, concluding with the poignant remark, "Please excuse my not mailing this, but I don't know your new address." Unable to concentrate on conventional research, Feynman began exploring physics problems for personal gratification rather than practical utility. One such endeavor involved analyzing the physics of a twirling, nutating disk in motion, an idea sparked by observing a tossed dinner plate in the Cornell cafeteria. He studied Sir William Rowan Hamilton's work on quaternions, attempting unsuccessfully to apply them to formulate a relativistic theory of electrons. Although his work during this period, which utilized equations of rotation to describe various spinning speeds, ultimately proved foundational to his Nobel Prize–winning contributions, his feeling of burnout and shift towards less immediately practical problems led him to be surprised by professorship offers from other distinguished institutions, including the Institute for Advanced Study, the University of California, Los Angeles, and the University of California, Berkeley.

Feynman was not the only theoretical physicist experiencing significant frustration in the early post-war era. Quantum electrodynamics (QED) was fundamentally challenged by the occurrence of infinite integrals within its perturbation theory, a clear mathematical flaw that Feynman and Wheeler had unsuccessfully attempted to circumvent. Murray Gell-Mann notably remarked that "Theoreticians were in disgrace" during this period. In June 1947, leading American physicists gathered at the Shelter Island Conference, an event Feynman described as his "first big conference with big men... I had never gone to one like this one in peacetime." Although the persistent issues within quantum electrodynamics were discussed, the contributions of the theoreticians were largely overshadowed by the groundbreaking achievements of experimentalists, who reported the discovery of the Lamb shift, the measurement of the electron's magnetic moment, and Robert Marshak's two-meson hypothesis.

Building upon Hans Kramers' research, Bethe successfully derived a renormalized non-relativistic quantum equation to explain the Lamb shift. The subsequent challenge involved developing a relativistic counterpart. Feynman believed he could achieve this, but his proposed solution, when presented to Bethe, failed to converge. Undeterred, Feynman meticulously re-examined the problem, employing the path integral formulation he had developed in his doctoral thesis. Similar to Bethe, he rendered the integral finite by introducing a cut-off term, and his result aligned with Bethe's earlier version. Feynman subsequently presented his findings to his colleagues at the 1948 Pocono Conference, where the reception was unfavorable. Following a lengthy exposition by Julian Schwinger on his quantum electrodynamics work, Feynman introduced his own approach, titled "Alternative Formulation of Quantum Electrodynamics." The audience found the novel Feynman diagrams, utilized for the first time, perplexing. Consequently, Feynman struggled to convey his concepts effectively, encountering objections from prominent figures such as Paul Dirac, Edward Teller, and Niels Bohr.

Freeman Dyson recognized that Shin'ichirō Tomonaga, Schwinger, and Feynman possessed a profound understanding of their subject, despite the lack of published work and the general incomprehension of others. Dyson was convinced of the superior clarity of Feynman's formulation and eventually persuaded Oppenheimer of its merits. In 1949, Dyson published a significant paper that augmented Feynman's framework with new rules for implementing renormalization. This development prompted Feynman to disseminate his concepts through a series of articles in the Physical Review over a three-year period. His 1948 publications, notably "A Relativistic Cut-Off for Classical Electrodynamics," aimed to elucidate the ideas he had struggled to convey at the Pocono Conference. The 1949 paper, "The Theory of Positrons," explored the Schrödinger and Dirac equations and introduced the concept now known as the Feynman propagator. Subsequently, in "Mathematical Formulation of the Quantum Theory of Electromagnetic Interaction" (1950) and "An Operator Calculus Having Applications in Quantum Electrodynamics" (1951), Feynman elaborated the mathematical underpinnings of his theories, deriving established formulas and proposing novel ones.

Initially, other researchers primarily cited Schwinger's work; however, by 1950, publications referencing Feynman and utilizing Feynman diagrams began to emerge and rapidly gained widespread acceptance. Students quickly adopted and applied this potent new analytical tool developed by Feynman. Subsequently, computer programs were developed to evaluate Feynman diagrams, thereby enabling physicists to employ quantum field theory for generating highly precise predictions. Marc Kac further extended Feynman's method of summing over a particle's possible histories, applying it to the analysis of parabolic partial differential equations. This adaptation resulted in the Feynman–Kac formula, a concept whose utility transcends physics, finding numerous applications in stochastic processes. Julian Schwinger, however, famously characterized the Feynman diagram as "pedagogy, not physics."

Reflecting on this era, Feynman often recalled his tenure at the Telluride House, where he resided for a significant portion of his career at Cornell University, with great affection. In an interview, he characterized the House as "a group of boys that have been specially selected because of their scholarship, because of their cleverness or whatever it is, to be given free board and lodging and so on, because of their brains." He appreciated the convenience offered by the residence and asserted that "it's there that I did the fundamental work" for which he was later awarded the Nobel Prize.

Nevertheless, reports indicate that Feynman experienced a period of restlessness during his tenure at Cornell. By 1949, towards the conclusion of this phase, he had not yet established a permanent residence, instead relocating frequently among guest houses and student accommodations. He reportedly resided with several married friends for periods, though these arrangements often concluded when they "became sexually volatile".

At the age of 31, Feynman was reportedly observed to frequently engage in romantic pursuits with married female acquaintances and undergraduate students, and to employ sex workers; Gleick notes that this conduct adversely affected numerous friendships. Feynman subsequently documented his dislike for Ithaca's severe winter climate and his perception of living under the influence of Hans Bethe during his time at Cornell.

Brazil (1949–1952)

Feynman spent several weeks in Rio de Janeiro during July 1949. In the same year, the Soviet Union's detonation of its inaugural atomic bomb intensified concerns regarding espionage. Klaus Fuchs was apprehended as a Soviet spy in 1950, leading the FBI to interrogate Bethe concerning Feynman's loyalty. Physicist David Bohm was arrested on December 4, 1950, and subsequently emigrated to Brazil in October 1951. Amidst anxieties about potential nuclear conflict, a girlfriend advised Feynman to consider relocating to South America. With a sabbatical scheduled for 1951–1952, he chose to spend it in Brazil, delivering courses at the Centro Brasileiro de Pesquisas Físicas.

While in Brazil, Feynman developed an appreciation for samba music and acquired proficiency in playing the frigideira, a metal percussion instrument derived from a frying pan. He was an ardent amateur performer on bongo and conga drums, frequently playing them in pit orchestras for musicals. He also spent time in Rio with his friend Bohm, though Bohm was unsuccessful in persuading Feynman to explore his physics theories.

Caltech and Later Years (1952–1978)

Personal and Political Life

Feynman did not resume his position at Cornell. Bacher, who had been pivotal in Feynman's initial recruitment to Cornell, successfully persuaded him to join the California Institute of Technology (Caltech). A condition of this agreement allowed Feynman to spend his inaugural year on sabbatical in Brazil. He had developed a strong affection for Mary Louise Bell, originally from Neodesha, Kansas. Their initial encounter occurred in a Cornell cafeteria, where she was studying the history of Mexican art and textiles. She subsequently followed him to Caltech, attending one of his lectures. While Feynman was in Brazil, Bell instructed courses on the history of furniture and interiors at Michigan State University. He proposed to her via mail from Rio de Janeiro, and they were married in Boise, Idaho, on June 28, 1952, shortly after his return. Their relationship was marked by frequent disagreements, and she expressed fear of what she characterized as "a violent temper". Their political ideologies diverged; although Feynman registered and voted as a Republican, Bell held more conservative views, and her stance on the 1954 Oppenheimer security hearing ("Where there's smoke there's fire") caused him offense. They separated on May 20, 1956. An interlocutory decree of divorce was issued on June 19, 1956, citing "extreme cruelty" as the grounds. The divorce was finalized on May 5, 1958.

... the appointee's wife was granted a divorce from him because of appointee's constantly working calculus problems in his head as soon as awake, while driving car, sitting in living room, and so forth, and that his one hobby was playing his African drums. His ex-wife reportedly testified that on several occasions when she unwittingly disturbed either his calculus or his drums he flew into a violent rage, during which time he choked her, threw pieces of bric-a-brac about and smashed the furniture ...

Following the 1957 Sputnik crisis, governmental interest in scientific endeavors temporarily increased within the U.S. Feynman was considered for a position on the President's Science Advisory Committee but ultimately was not appointed. During this period, the FBI interviewed a woman closely associated with Feynman, potentially his ex-wife Bell, who submitted a written statement to J. Edgar Hoover on August 8, 1958:

I do not know—but I believe that Richard Feynman is either a Communist or very strongly pro-Communist—and as such is a very definite security risk. This man is, in my opinion, an extremely complex and dangerous person, a very dangerous person to have in a position of public trust ... In matters of intrigue Richard Feynman is, I believe immensely clever—indeed a genius—and he is, I further believe, completely ruthless, unhampered by morals, ethics, or religion—and will stop at absolutely nothing to achieve his ends.

Despite prior circumstances, the U.S. government dispatched Feynman to Geneva for the September 1958 Atoms for Peace Conference. While at Lake Geneva, he encountered Gweneth Howarth, a native of Ripponden, West Yorkshire, who was employed in Switzerland as an au pair. Feynman's personal relationships had been tumultuous following his divorce; a prior girlfriend had absconded with his Albert Einstein Award medal, and another, acting on advice, had falsely claimed pregnancy to extort funds for an abortion, subsequently using the money for furniture. Upon discovering Howarth's monthly remuneration of $25, Feynman proposed a weekly payment of $20 (equivalent to $202 in 2022) for her to serve as his live-in maid. Recognizing the potential illegality of this arrangement under the Mann Act, Feynman arranged for his friend, Matthew Sands, to act as her sponsor. Howarth initially noted her existing romantic relationships but ultimately accepted Feynman's proposition, relocating to Altadena, California, in June 1959. Despite her continued independent dating, Feynman proposed marriage in early 1960. Their marriage took place on September 24, 1960, at the Huntington Hotel in Pasadena. The couple had a son, Carl, in 1962, and subsequently adopted a daughter, Michelle, in 1968. In addition to their Altadena residence, they acquired a beach house in Baja California, funded by Feynman's Nobel Prize earnings.

Allegations of Sexism

Protests regarding Feynman's alleged sexism occurred at Caltech in both 1968 and 1972. Demonstrators specifically criticized his incorporation of sexist anecdotes concerning 'lady drivers' and uninformed women into his lectures. Feynman recounted an instance in San Francisco where protesters entered a lecture hall, picketing his impending presentation and labeling him a "sexist pig". He later reflected that this incident prompted him to engage with the protesters, acknowledging that "women do indeed suffer prejudice and discrimination in physics, and your presence here today serves to remind us of these difficulties and the need to remedy them".

In his 1985 memoir, Surely You're Joking, Mr. Feynman!, Feynman recounted various personal experiences, including conducting meetings in strip clubs, employing a student as a nude life model during his art studies at Caltech, and feigning undergraduate status to engage in sexual encounters with younger women.

Feynman Diagram Van

In 1975, in Long Beach, California, Feynman acquired a Dodge Tradesman Maxivan, distinguished by its bronze-khaki exterior, yellow-green interior, and bespoke exterior murals depicting Feynman diagrams. He selected QANTUM for the license plate identification, as QED and QUARK were unavailable. Following Feynman's demise, Gweneth sold the vehicle for $1 to Ralph Leighton, a film producer and friend of Feynman, who subsequently placed it in storage, where it deteriorated due to rust. In 2012, Seamus Blackley, a video game designer recognized for his role in the development of the Xbox, purchased the van.

Physics

While at Caltech, Feynman conducted research into the superfluidity of supercooled liquid helium, a phenomenon characterized by helium's apparent absence of viscosity during flow. He subsequently offered a quantum-mechanical elucidation for the superfluidity theory proposed by Soviet physicist Lev Landau. The application of the Schrödinger equation to this inquiry revealed that the superfluid exhibited quantum mechanical behavior discernible at a macroscopic level. Although this work contributed to understanding superconductivity, Feynman did not achieve a complete solution to this problem. The definitive solution emerged with the BCS theory of superconductivity, formulated by John Bardeen, Leon Neil Cooper, and John Robert Schrieffer in 1957.

Motivated by the objective of quantizing the Wheeler–Feynman absorber theory of electrodynamics, Feynman established the foundational principles for both the path integral formulation and Feynman diagrams.

In collaboration with Murray Gell-Mann, Feynman formulated a model of weak decay, demonstrating that the current coupling within this process comprises a combination of vector and axial currents. (A characteristic instance of weak decay involves the disintegration of a neutron into an electron, a proton, and an antineutrino). While E. C. George Sudarshan and Robert Marshak independently developed a similar theory almost concurrently, Feynman's joint work with Gell-Mann was considered groundbreaking due to its elegant description of the weak interaction through vector and axial currents. This framework effectively integrated Enrico Fermi's 1933 beta decay theory with an explanation for parity violation.

Feynman proposed the parton model to elucidate the strong interactions governing nucleon scattering. This model complemented the quark model, which Gell-Mann had previously developed. The conceptual connection between these two models remained ambiguous, prompting Gell-Mann to pejoratively label Feynman's partons as "put-ons." During the mid-1960s, the prevailing view among physicists was that quarks functioned merely as a notational convenience for symmetry numbers rather than representing actual particles; the statistical properties of the omega-minus particle, if construed as a composite of three identical strange quarks, appeared irreconcilable with the notion of quarks as fundamental entities.

Deep inelastic scattering experiments conducted at the SLAC National Accelerator Laboratory in the late 1960s revealed that nucleons, comprising protons and neutrons, contained point-like constituents responsible for electron scattering. While these constituents were naturally associated with quarks, Feynman's parton model sought to interpret the empirical data without positing further hypotheses. For instance, the experimental results indicated that approximately 45% of the nucleon's energy-momentum was attributed to electrically neutral particles. These neutral particles are now understood as gluons, which mediate the strong force between quarks; their three-valued color quantum number provides a resolution to the omega-minus particle anomaly. Feynman did not contest the quark model; for example, upon the discovery of the fifth quark in 1977, he promptly informed his students that this finding portended the existence of a sixth quark, which was subsequently identified within a decade following his passing.

Subsequent to the achievements in quantum electrodynamics, Feynman directed his research toward quantum gravity. Drawing an analogy with the spin-1 photon, he explored the implications of a free, massless spin-2 field, from which he derived the Einstein field equations of general relativity, though his contributions in this area did not extend significantly beyond this. The computational construct Feynman developed for gravity, known as "ghosts"—conceptual particles within his diagrams exhibiting an anomalous relationship between spin and statistics—has proven indispensable for elucidating the quantum particle dynamics of Yang–Mills theories, including quantum chromodynamics and the electroweak theory. His research encompassed all four fundamental interactions of nature: electromagnetic, weak, strong, and gravitational forces. John and Mary Gribbin assert in their biographical work on Feynman that "No other individual has contributed so significantly to the exploration of all four fundamental interactions."

To generate public awareness regarding advancements in physics, Feynman instituted $1,000 prizes for two nanotechnology challenges; William McLellan claimed one, and Tom Newman claimed the other.

Feynman also demonstrated an interest in the nexus between physics and computation. Furthermore, he was among the pioneering scientists to conceptualize the potential of quantum computing. During the 1980s, he dedicated his summers to working at Thinking Machines Corporation, where he contributed to the development of early parallel supercomputers and explored the feasibility of constructing quantum computers.

From 1984 to 1986, he devised a variational method for the approximate computation of path integrals. This innovation subsequently yielded a robust technique for transforming divergent perturbation expansions into convergent strong-coupling expansions, known as variational perturbation theory, and consequently facilitated the most precise determination of critical exponents observed in satellite experiments. While at Caltech, he famously inscribed the aphorism "What I cannot create I do not understand" on his blackboard.

Feynman's research also encompassed machine technology.

Feynman had previously engaged with the concepts of John von Neumann during his investigations into quantum field theory. His most renowned lecture on this topic was presented in 1959 at the California Institute of Technology and subsequently published a year later under the title "There's Plenty of Room at the Bottom." Within this lecture, he posited future prospects for developing miniaturized machines capable of self-replication at smaller scales. This seminal lecture is extensively referenced in technical publications pertaining to microtechnology and nanotechnology.

Feynman further proposed the theoretical feasibility of constructing nanoscale machines capable of precisely arranging atoms and performing chemical synthesis through mechanical manipulation.

He additionally introduced the concept of "swallowing the doctor," an idea he attributed in his essay to his friend and graduate student, Albert Hibbs. This particular concept entailed the development of a minute, ingestible surgical robot.

Pedagogy

In the early 1960s, Feynman undertook the task of improving undergraduate instruction at Caltech. Following three years dedicated to this endeavor, he developed a lecture series subsequently published as The Feynman Lectures on Physics. The initial reception of these lectures is subject to varying interpretations. Feynman's own preface, composed following a poorly performing student examination, conveyed a degree of pessimism. Colleagues David L. Goodstein and Gerry Neugebauer later observed that while first-year students found the content challenging, more advanced students and faculty members considered it highly inspiring, leading to sustained attendance despite a decline in first-year participation. Conversely, physicist Matthew Sands remembered the student attendance as consistent with that of a standard large lecture course.

The conversion of these lectures into book format required several years of part-time collaboration from Matthew Sands and Robert B. Leighton. Feynman proposed a cover design featuring a drum adorned with mathematical diagrams of vibrations, intending to symbolize the application of mathematics in comprehending the physical world. However, the publishers opted for plain red covers, albeit including a photograph of Feynman playing drums within the foreword. Despite not being widely adopted as university textbooks, these volumes maintain strong sales due to their profound insights into physics.

Numerous other publications emerged from Feynman's lectures and various talks, including The Character of Physical Law, QED: The Strange Theory of Light and Matter, Statistical Mechanics, Lectures on Gravitation, and the Feynman Lectures on Computation.

Feynman documented his experiences instructing undergraduate physics students in Brazil. He observed that the students' study methods and the Portuguese textbooks lacked contextual relevance and practical applications, leading him to conclude that the students were not genuinely acquiring physics knowledge. At the conclusion of the academic year, Feynman accepted an invitation to lecture on his pedagogical observations, stipulating the condition of speaking candidly, which he subsequently fulfilled.

Feynman strongly advocated against rote learning, or uncritical memorization, and other instructional approaches prioritizing form over substantive understanding. He considered clear thinking and clear presentation to be essential prerequisites for engaging his attention. Approaching him without adequate preparation could be precarious, as he held a lasting disdain for those he perceived as intellectually unsound or disingenuous.

In 1964, he served on the California State Curriculum Commission, an entity tasked with approving textbooks for use in California schools. His assessment of the materials was largely negative. He noted that many mathematics textbooks, particularly those associated with the "New Math" movement, included topics primarily relevant to pure mathematicians. Elementary students, for instance, were instructed on set theory, yet:

It may surprise many who have studied these textbooks to discover that the elaborate notation for sets, including symbols like ∪ and ∩ for union and intersection, and the specialized use of brackets { }, which is extensively presented in these books, is almost entirely absent from theoretical physics, engineering, business arithmetic, computer design, or other fields where mathematics is applied. I perceive no necessity or rationale for its comprehensive explanation or instruction in schools. It does not offer a useful, cogent, or simple method of expression. While precision is claimed, its purpose remains unclear.

In April 1966, Feynman addressed the National Science Teachers Association, proposing methods to cultivate scientific thinking in students, emphasizing open-mindedness, curiosity, and particularly, skepticism. During this lecture, he presented a definition of science, outlining its development through several distinct stages. The first stage involved the evolution of intelligent life on Earth, exemplified by creatures like cats that engage in play and acquire knowledge through experience. The second stage was the evolution of humans, who developed language to transmit knowledge intergenerationally, thereby preventing its loss upon an individual's demise. However, this transmission mechanism allowed for the perpetuation of erroneous information alongside accurate knowledge, necessitating a further evolutionary step. This crucial third stage involved figures like Galileo, who began to question inherited truths and to investigate ab initio, or from direct experience, the actual state of affairs—a process he defined as science.

In 1974, Feynman presented the Caltech commencement address, focusing on the concept of cargo cult science. He characterized this phenomenon as possessing the superficial appearance of scientific inquiry but lacking genuine scientific integrity, which he defined as "a principle of scientific thought that corresponds to a kind of utter honesty" from the researcher. He advised the graduating cohort that "The first principle is that you must not fool yourself—and you are the easiest person to fool. So you have to be very careful about that. After you've not fooled yourself, it's easy not to fool other scientists. You just have to be honest in a conventional way after that."

Feynman mentored 30 doctoral students throughout his career.

Proceedings Before the Equal Employment Opportunity Commission

In 1977, Feynman advocated for his English literature colleague, Jenijoy La Belle, who had been appointed as Caltech's inaugural female professor in 1969. La Belle initiated a lawsuit with the Equal Employment Opportunity Commission after being denied tenure in 1974. The EEOC ruled against Caltech in 1977, further noting that La Belle's compensation was lower than that of her male counterparts. Ultimately, La Belle was granted tenure in 1979. Many of Feynman's peers expressed astonishment at his support for her, yet he had developed a personal acquaintance with La Belle and held her in high regard.

Surely You're Joking, Mr. Feynman!

During the 1960s, Feynman contemplated authoring an autobiography and commenced providing interviews to historians. In the 1980s, collaborating with Ralph Leighton, son of Robert Leighton, he recorded various chapters on audio tape, which Ralph subsequently transcribed. The resulting book, Surely You're Joking, Mr. Feynman!, was published in 1985 and achieved best-seller status.

Gell-Mann expressed displeasure with Feynman's depiction of the weak interaction research within the book and issued a threat of legal action, which led to the inclusion of a correction in subsequent editions. This event represented the most recent in a series of long-standing tensions between the two scientists. Gell-Mann frequently voiced his exasperation regarding the public recognition Feynman garnered, commenting: "[Feynman] was a great scientist, but he spent a great deal of his effort generating anecdotes about himself."

Feynman has faced criticism concerning a chapter in the book titled "You Just Ask Them?", in which he recounts his acquisition of seduction techniques at a bar during the summer of 1946. A mentor reportedly instructed him to inquire about sexual intimacy with a woman prior to purchasing her anything. He characterizes his internal perception of women at the bar as "bitches" and narrates an incident where he informed a woman named Ann that she was "worse than a whore." This occurred after Ann convinced him to buy sandwiches by suggesting they could consume them at her residence, only to subsequently state, post-purchase, that they could not eat together due to another man's impending arrival. Later that evening, Ann returned to the bar and accompanied Feynman to her home. Feynman concludes the chapter by asserting that this conduct was atypical for him: "So it worked even with an ordinary girl! But no matter how effective the lesson was, I never really used it after that. I didn't enjoy doing it that way. But it was interesting to know that things worked much differently from how I was brought up."

The Challenger Disaster

Feynman assumed a significant role on the Presidential Rogers Commission, tasked with investigating the 1986 Space Shuttle Challenger disaster. Initially hesitant to participate, he was ultimately convinced by his wife's counsel. Feynman frequently encountered disagreements with the commission's chairman, William P. Rogers. During a recess in one hearing, Rogers reportedly remarked to fellow commission member Neil Armstrong, "Feynman is becoming a pain in the ass."

During a televised session, Feynman illustrated that the O-ring material utilized in the shuttle exhibited reduced resilience in cold temperatures. He achieved this by compressing a material sample in a clamp and submerging it in ice-cold water. The commission subsequently concluded that the catastrophe resulted from the primary O-ring's failure to seal effectively under unusually cold conditions at Cape Canaveral. In an appendix to the commission's report, he issued a caution: "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled."

Recognition and Awards

Feynman's contributions first received public acknowledgment in 1954, when Lewis Strauss, then chairman of the Atomic Energy Commission (AEC), informed him of his selection for the Albert Einstein Award, an honor accompanied by a $15,000 prize and a gold medal. Feynman initially hesitated to accept the award due to Strauss's controversial role in revoking Oppenheimer's security clearance. However, Isidor Isaac Rabi advised him against refusal, stating, "One should never weaponize a man's generosity against him. Any positive attribute a person possesses, despite any flaws, should not be exploited as a means of opposition." Subsequently, he was granted the AEC's Ernest Orlando Lawrence Award in 1962. In 1965, Feynman, alongside Schwinger and Tomonaga, was awarded the Nobel Prize in Physics "for their fundamental work in quantum electrodynamics, with deep-ploughing consequences for the physics of elementary particles." Further accolades included election as a Foreign Member of the Royal Society in 1965, receipt of the Oersted Medal in 1972, and the National Medal of Science in 1979. Although elected a Member of the National Academy of Sciences, he later resigned and is no longer formally recognized by the institution. Schwinger characterized him as "an honest man, the outstanding intuitionist of our age, and a prime example of what may lie in store for anyone who dares follow the beat of a different drum."

Death

In 1978, Feynman sought medical attention for abdominal discomfort, leading to a diagnosis of liposarcoma, an uncommon malignancy. Surgical intervention successfully removed a substantial tumor that had compromised one kidney and his spleen. By 1986, medical professionals identified a secondary malignancy, Waldenström macroglobulinemia. Additional surgical procedures were conducted in October 1986 and October 1987. His hospitalization at the UCLA Medical Center recommenced on February 3, 1988. Renal failure, precipitated by a ruptured duodenal ulcer, led him to decline dialysis, a treatment that could have extended his life by several months. During his final days, Feynman was attended by his wife Gweneth, sister Joan, and cousin Frances Lewine, until his passing on February 15, 1988, at the age of 69.

As Feynman approached the end of his life, he inquired of his friend and colleague, Danny Hillis, regarding Hillis's apparent sadness. Hillis responded by expressing his belief that Feynman's death was imminent. Hillis recounted Feynman's subsequent remark:

"Yeah," he sighed, "that bugs me sometimes too. But not so much as you think. [...] When you get as old as I am, you start to realize that you've told most of the good stuff you know to other people anyway."

Towards the conclusion of his life, Feynman endeavored to The official authorization for the journey from the Soviet government arrived posthumously, the day following his death. His daughter, Michelle, subsequently completed the trip. Ralph Leighton documented this endeavor in his 1991 publication, Tuva or Bust!.

Feynman was interred at Mountain View Cemetery and Mausoleum in Altadena, California. His final utterance, "This dying is boring," reportedly referred to the prolonged comatose state preceding his demise.

Popular legacy

Feynman's life and persona have been depicted across diverse media formats. In the 1996 biographical film Infinity, Matthew Broderick portrayed Feynman. Actor Alan Alda commissioned playwright Peter Parnell to create a two-character play, depicting a fictional day in Feynman's life approximately two years prior to his death. This play, titled QED, debuted at the Mark Taper Forum in Los Angeles in 2001 and subsequently transferred to the Vivian Beaumont Theater on Broadway, with Alda starring as Richard Feynman in both stagings. Real Time Opera presented the premiere of its opera, Feynman, at the Norfolk (Connecticut) Chamber Music Festival in June 2005. A biographical graphic novel, simply titled Feynman, authored by Jim Ottaviani and illustrated by Leland Myrick, was published in 2011, focusing on Feynman's life. Feynman's involvement with the Rogers Commission was dramatized by the BBC in 2013's The Challenger (released in the US as The Challenger Disaster), featuring William Hurt in the role of Feynman. In 2016, Oscar Isaac publicly read Feynman's 1946 love letter addressed to his late wife, Arline. The 2023 American film Oppenheimer, directed by Christopher Nolan and adapted from American Prometheus, features Jack Quaid portraying Feynman.

On May 4, 2005, the United States Postal Service issued the "American Scientists" commemorative set, comprising four 37-cent stamps in various configurations. This collection featured scientists Richard Feynman, John von Neumann, Barbara McClintock, and Josiah Willard Gibbs. Feynman's specific stamp included a photograph of him in his thirties, alongside eight miniature Feynman diagrams. Victor Stabin designed these stamps, with Carl T. Herrman providing artistic direction. In recognition of his contributions, the primary building of the Computing Division at Fermilab is designated the "Feynman Computing Center," a naming convention also applied to the Richard P. Feynman Center for Innovation at the Los Alamos National Laboratory. Apple Computer's "Think Different" advertising campaign, initiated in 1997, incorporated two photographs of Feynman. The fictional theoretical physicist Sheldon Cooper, from the television series The Big Bang Theory, was portrayed as an admirer of Feynman, notably emulating him by playing the bongo drums. On January 27, 2016, Microsoft co-founder Bill Gates authored an article titled "The Best Teacher I Never Had," which lauded Feynman's pedagogical abilities. This article motivated Gates to establish Project Tuva, an initiative to make videos of Feynman's Messenger Lectures, The Character of Physical Law, accessible to the public via a dedicated website. Furthermore, in 2015, Gates produced a video for Caltech, offering his reflections on Feynman's unique qualities, coinciding with the 50th anniversary of Feynman's 1965 Nobel Prize.

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About Richard Feynman

A short guide to Richard Feynman's life, research, discoveries and scientific influence.

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