In 1654, two giants of mathematics, Blaise Pascal and Pierre de Fermat, began to exchange letters about games of chance. This correspondence resulted in Pascal writing Traité du triangle arithmétique, ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Pretend you're me and you're in math class. Actually, never mind. I'm sick, so I'm staying home today.