How do the Ghosts in Pac Man Move? →

The ghosts in Pac-Man are among some of the most enduring enemies in video game history, thanks in part to their surprisingly difficult to predict movements which make the game a constant challenge for new and seasoned players alike. However, as it turns out, the ghost’s movements are defined by a deceptively simple set of algorithms thought up by the game’s designer, Toru Iwatani.

How Pregnancy Tests Work →

Over-the-counter pregnancy tests give potentially life-changing results with a pretty high rate of accuracy. But how do they work? Tien Nguyen explains how each test performs a scientifically rigorous, multi-stage experiment that goes from start to finish in the time that it’ll take you to watch this video.