Mathematician John Conway was born #OTD in 1937. He made broad and profound contributions across all of mathematics, but he is maybe best known by the general public for his "game of life" cellular automaton. Conway passed away in 2020, from COVID-19.
@mcnees Huh! Guessing Conway shook hands with Donald Knuth at some point? So I'm five away... (Do we now all need to calculate our Erdős-Bacon-Sabbath-Napoleon numbers?)