Yeast and sugar generator can power cellphones, but how does it work?

This yeast-and-sugar powered generator invented by Dr. Cedrick Ngalande of Malawi can supposedly power cellphones, OLPCs, and medical devices for up to eight hours, but apart from a few vague guesses involving CO2, oscillating motion, and a couple Sharper Image desk toys we've got lying around, we're utterly at a loss to explain how it works. Ideas, leave 'em in comments!

[Via Afrigadget]

[weirdo557 Posted Dec 3rd 2007 10:45PM]

its obvious, its made of science and stuff :P, everything made of science and stuff works magically.
(joke just in case ur about to flame)

[wineman Posted Dec 4th 2007 11:45AM]

Take a coke or any drink with sugar, add a little yeast from almost anywhere (that's the white powder you see on a bunch of grapes - Not cocaine!)mix together and you start "primary fermentation". Open the valve on the right, pour it in and it will start gassing or bubbling, eventually forcing all the liquid uphill till it rocks to the other side. This goes back and forth till the yeast eats up all the sugar in the mix.... or till the build up of pressure inhibits fermentation. Gotta have a relief valve somewhere on the back side of this thing. rocking motion cranks a simple generator. Very inventive!