A: So far, the fastest anyone has run is about 27 1/2 mph, a speed reached (briefly) by sprinter Usain Bolt just after the midpoint of his world-record 100-meter dash in 2009. This speed limit is ...

So far, the fastest any human has run is about 27 1/2 mph, a speed reached (briefly) by sprinter Usain Bolt just after the midpoint of his world-record 100-meter dash in 2009. This speed limit is ...

Stephen Vrska, a marathon and ultra runner from Chesterton, Indiana, first discovered the joy of running back in the 6th grade. “My middle school didn't offer football until the following year, so I ...

Just how fast can the fastest human run? This adapted book excerpt from Infinite Powers reveals how calculus helps us investigate the nature of motion and change. “Art,” said Pablo Picasso, “is a lie ...