The bicycle is one of the most efficient, environmentally friendly modes of transportation, even centuries after its creation. There's no lack of innovation happening when it comes to bikes either. The latest example is the Alfa: a 9kg bike made primarily of cardboard and capable of holding nearly 230kg.
According to .CoDesign, the belt-driven design of the bike makes it a maintenance-free ride and could even be adapted to house an electric motor. In the works for more than three years, inventor Izhar Gafni is still in the process of raising funds for production, but its an idea so good, it'd be a shame for it not to become reality. Oh, and it only cost $US10 to make. [NewsGeek via No Camels via DesignTaxi via FastCoDesign]