The Nobel Prize in Physics was awarded to Murray Gell-Mann in 1969. Gell-Mann was recognized for his work on Theory of quarks, which are subatomic particles that make up protons and neutrons. Gell-Mann's theory helped to explain the structure of the atomic nucleus and led to the development of the Standard Model of particle physics.
The Magnificent Mind of Murray Gell-Mann: A Spectacular Quiz on the Life and Work of an American Physics Luminary