rocket stove
http://www.youtube.com/watch?v=mOvclxvLCdE
http://www.youtube.com/watch?v=5OIZekftbxw
http://www.youtube.com/watch?v=uR-LqOquLZA
http://www.youtube.com/watch?v=b3pxpWXUxbI
http://www.youtube.com/watch?v=Knh1UWjLkmo
http://www.youtube.com/watch?v=235m0EzZF4U
http://www.youtube.com/watch?v=P6ValmUnjz4&feature=youtu.be
http://www.treehugger.com/gadgets/build-mini-rocket-stove-upcycled-tin-cans.html