Featured in marathons

What extreme heat means for the future of the Summer Olympics
4 high-tech running shoes that could help Tokyo Olympians hit record-breaking times
How Abebe Bikila won the Olympic marathon without shoes
Eliud Kipchoge just ran a marathon in less than two hours—how much faster does science say humans can get?
How Nike engineered its latest record-breaking marathon shoe
Science helped me run my first marathon in 3 hours and 21 minutes
Humans are natural runners—and this ancient gene mutation might have helped
The weirdest things we learned this week: Lady Liberty’s big secret, the ultimate exercise hack, and a penis in a bottle
Nike put its energy-returning foam into a shoe you can train in
The weirdest things we learned this week: Cruise ships full of poop, deadly wallpaper, and the sport where women beat men