Charm
The name given by physicists to the fourth of the six quarks known to date. The "c" quark was discovered at the end of 1974 in the United States. It had been predicted a few years earlier in order to make sense of experimental observations for which no explanation could be found in a model that included only three light quarks: up, down, and strange quarks. This discovery, known as the "November revolution", has shown that quarks are a central piece in our understanding of the infinitely small.