The bicycle is one of the most efficient, environmentally-friendly modes of transportation, even centuries after its creation. Still though, there's no lack of innovation happening when it comes to bike. The latest example of this is the Alfa: a
20-pound bike made primarily of cardboard which is capable of holding nearly 500 pounds. Oh, and it only costs $10 to make.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/i5PEuxaFl1k/a-bike-this-cool-cant-possibly-be-made-from-cardboard-or-cost-10-to-make
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