Usain Bolt tops out at 27.3 miles per hour, but he could do better—and so could you. According to Wired:

“The human frame is built to handle running speeds up to 40 miles per hour, scientists say. The only limiting factor is not how much brute force is required to push off the ground as previously thought, but how fast our muscle fibers can contract to ramp up that force.” Read the rest here >>