I'll Run Across Water Yet

Going through old Scientific Americans. I like how they did brain scans of tango dancers trapped in positions of limited mobility to see how they respond to music. Claustrophobia makes tango dancers unhappy. But also, an answer to how fast people would have to be in order to run across water. Turns out, it's 30 m/s (65 mph). Expend 15 times as much muscular power than people can do. Time to improve aerobic conditioning!