Richard Feynman dies at the UCLA Medical Center due to complications from cancer (liposarcoma) and a ruptured duodenal ulcer, leading to kidney failure. He declined dialysis, and his wife Gweneth, sister Joan, and cousin Frances Lewine were by his side during his final days. His death marked the end of a highly influential career in theoretical physics and science popularization.

Richard Feynman marries Gweneth Howarth at the Huntington Hotel in Pasadena. Gweneth, originally from England, was working as an au pair when they met. This marriage proved to be a long-lasting and supportive partnership.

A woman close to Richard Feynman, possibly his ex-wife Mary Louise Bell, sent a written statement to J. Edgar Hoover expressing her belief that Feynman was either a Communist or very strongly pro-Communist and as such is a very definite security risk.

The divorce between Richard Feynman and Mary Louise Bell becomes final. The divorce was granted on the grounds of 'extreme cruelty'.

An interlocutory decree of divorce was entered for Richard Feynman and Mary Louise Bell, on the grounds of 'extreme cruelty'.

Richard Feynman and Mary Louise Bell separated.

Richard Feynman marries Mary Louise Bell in Boise, Idaho. They had met at Cornell University where Mary was studying Mexican art and textiles. Their marriage was marked by frequent quarrels and different political views, ultimately ending in divorce.

Physicist David Bohm was arrested and emigrated to Brazil in October 1951, due to the fears of a nuclear war.

Melville Feynman, Richard Feynman's father, dies suddenly. This event caused Feynman to suffer from depression, further compounding the personal losses he had experienced in recent years. Unable to focus on research, he started working on less immediately practical physics problems, motivated purely by self-satisfaction.

Arline Greenbaum Feynman, Richard Feynman's first wife, passed away in Albuquerque, New Mexico, after battling tuberculosis. Her death deeply affected Feynman, but he immersed himself in his work at Los Alamos following her passing. This event marked a significant personal loss for Feynman during his involvement in the Manhattan Project.

Richard Feynman and his wife Arline depart for Los Alamos, New Mexico, where Feynman would contribute to the Manhattan Project. This marked the beginning of Feynman's significant involvement in the development of the atomic bomb during World War II. Arline, due to her poor health, traveled with a wheelchair and was provided with a private room on the train. This journey highlights Feynman's commitment to his scientific work and his dedication to caring for his ailing wife amidst the demanding and secretive atmosphere of the Manhattan Project.

Richard Feynman marries Arline Greenbaum in a civil ceremony in Staten Island, New York. This occurred despite Arline's serious illness with tuberculosis, which was incurable at the time. The wedding was small and intimate, without family or friends present, due to Arline's condition and Feynman's scholarship restrictions. This act demonstrated Feynman's deep commitment and love for Arline, placing personal devotion above career constraints and societal expectations.

Richard Phillips Feynman was born in New York City. This is the beginning of the life of one of the most influential physicists of the 20th century.