![]() Over the course of a continuous seven-minute take, Rusczyk jumps and claps at the right times while scribbling equations. ![]() Meanwhile, on a digital blackboard, he starts trying to figure out when the clap and the jump will coincide. When the timer hits twenty-four seconds, Rusczyk claps. “Um, how long is this gonna take?” he asks, rolling his eyes like a teen-ager. He starts the clock, stares at it, and fidgets. Rusczyk, who is dark-haired, clean-shaven, and boyish, gestures to a digital timer that appears in a corner of the screen. The challenge is to keep going until we clap and jump at the same time. ![]() ![]() Every twenty-four seconds, we’re supposed to clap every forty-five seconds, we’re supposed to jump. At the start of a YouTube video titled “ Art of Problem Solving: Least Common Multiple,” Richard Rusczyk invites viewers to play a game.
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