Okay, this falls into the "seriously cool" cateory: There's a piece in today's New York Times about a device that uses the human knee as a power generator. With it, one "minute of walking can power a cell phone for 10 minutes." That's amazing -- because of course cell phones have to be charged, and that requires electricity and electricity ain't cheap (especially in "third world" countries) or "green." You can read the article here.
As always, a BIG tip 'o the mug to the Times' for its free content. (Also in today's issue, a truly grim article about plunging profits at newspaper around the country. I have to wonder: how many newspapers will still be around in two years?)