At the start of a YouTube video titled “Art of Problem Solving: Least Common Multiple,” Richard Rusczyk invites viewers to play a game. Every twenty-four seconds, we’re supposed to clap; every ...

Though many things seem more uncertain than ever, some things never change. James Cameron is still making Avatar movies. The State Street Chipotle is still out of ingredients. And, “Michigan Math” is ...

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? In a new video, mathematician Presh Talwalker of the YouTube channel Mind Your ...