DARPA's Cheetah robot—already the fastest legged robot in history—just broke its own land speed record of 18 miles per hour (mph). In the process, Cheetah also surpassed another very fast mover: Usain Bolt. According to the International Association of Athletics Federations, Bolt set the world speed record for a human in 2009 when he reached a peak speed of 27.78 mph for a 20-meter split during th
![DARPA's Cheetah Bolts Past the Competition](https://cdn-ak-scissors.b.st-hatena.com/image/square/ce0d5b1c8f79748112c8518d6cd709d2a0b98764/height=288;version=1;width=512/https%3A%2F%2Fi.ytimg.com%2Fvi%2FYqpO58x7vuE%2Fhqdefault.jpg)