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On a day like today, Nobel Prize laureate Murray Gell-Mann was born

September 15, 1928. Murray Gell-Mann (September 15, 1929 - May 24, 2019) was an American physicist who played a preeminent role in the development of the theory of elementary particles. Gell-Mann introduced the concept of quarks as the fundamental building blocks of the strongly interacting particles, and the renormalization group as a foundational element of quantum field theory and statistical mechanics. He played key roles in developing the concept of chirality in the theory of the weak interactions and spontaneous chiral symmetry breaking in the strong interactions, which controls the physics of the light mesons. In the 1970s he was a co-inventor of Quantum Chromodynamics (QCD) which explains the confinement of quarks in mesons and baryons and forms a large part of the Standard Model of elementary particles and forces. Gell-Mann received the 1969 Nobel Prize in Physics for his work regarding elementary particles.