Printing The World's Fastest Running Shoe

French-born engineer and designer Luc Fusaro claims he has invented a way to make the world’s fastest running shoe. The process allows Fusaro to take 3-D scans of a runner’s foot, then prints the shoes out of nylon polyamide powder on a 3D printer. It's said that the shoe can improve performance by as much as 3.5%--or about .35 seconds.  In a 100-meter dash, that could be the difference between a silver and a gold medal.

You wouldn't want to run a marathon in them, though. “It’s not good for more than 400 meters because it’s too stiff,” says Fusaro.