And the Winner Is ...

By LAUREN SMITH, ELIZABETH QUILL and MATT PETRIE

Hotfooting It

The energy from one human step: enough to power a couple of 60-watt light bulbs for one second. The energy from 28,500 steps: enough to power a passenger train.

That's the principle behind the "crowd farm," designed by two graduate students at the Massachusetts Institute of Technology's School of Architecture...