Two MIT students have developed a system of flooring that generates energy as people walk over it. They should really rename it though - "crowd farm" reminds us a little too much of the Matrix.
Editorial note: Whoa! You've found a super-old post here on BuzzFeed, from an earlier era of the site. It doesn't really represent where we are anymore, and may in fact be totally broken, but we're leaving it up as a part of our early history.