Five MIT students under the team name BioVolt have created a $2 gadget that uses biomass to generate electricity. The output of the device isn't particularly significant -- six months to charge your cell means you shouldn't throw away that charger just yet -- but the low cost of the components, the availability of "biomass," and the capability for chaining multiple devices together means this is the perfect solution for isolated areas or poor communities. It's good news for the researchers too, who happened to win $5,000 in a design competition for their efforts. Good show lads.