15 year old builds a flashlight powered by body heat

Nice build of a flashlight, no details but it looks like some  Peltier devices where used to build it.  Those buggers are expensive, so I would figure the flashlight cost around $80 with the surface area being covered (or more).

http://hackedgadgets.com/2013/07/03/body-heat-powered-flashlight/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+HackedGadgets+%28Hacked+Gadgets%29