It’s never too early for math sequence riddles. Veritasium‘s Derek Muller offered a selection of strangers a simple sequence of three numbers — 2, 4, 8 — and asked them to determine the rule governing ...

Say you’re at a party with nine other people and everyone shakes everyone else’s hand exactly once. How many handshakes take place? This is the “handshake problem,” and it’s one of my favorites. As a ...