livescience.com: When you strap on a typical running shoe, you may be fighting evolution. Modern-day running shoes have changed the way people run, altering our gait from that of barefoot running — the manner by which people ran for thousands of years before the arrival of the cushioned shoes found on store she...

time.com: The world's fastest man sprinted past the coconut tree, down the winding hill and into the village of Cascade. On this late-November afternoon, Usain Bolt is home in Jamaica, filming a commercial for the national tourism agency, which is banking on his global stardom to lift the country's recessi...