This is REALLY cool! (I highly recommend you read the article to learn more about this)
There’s a new thing called “Power Felt” which uses temperature differences to create a charge. Essentially its going to allow us to do some pretty awesome things, like charge our cell phones/ other technologies just by walking around! (If your in class and your computer dies, no worries, just take a sprint around the room!)
You can put the felt on the back of your phone while its in your pocket or in your hand, and your body heat (while walking/moving) will be higher than the temperature outside, thus creating a “differential” and the felt will put off more heat turning it into electrical power.
This literally could be the most useful invention EVER! No more having to go home because your phone is dying, you can spend the night places without creepily bringing a charger over (“for those of you who like spontaneous sleepovers”), No more expenses to buy a phone charger for your moms house, dads house, boyfriends house, and of course the car charger. Just buy one piece of felt! Personally I’m pretty excited for this, I think it sounds awesome!
http://whatsnext.blogs.cnn.com/2012/03/30/nanotube-fabric-could-let-you-charge-your-phone-by-walking/