Engineer Izhar Gafni learned how to fold cardboard into
the strongest shapes possible, including honeycombs and bird
nests. The spokes, rims, and frame are made from cardboard; old car tires are
used as puncture-proof wheels, a car's timing belt as a chain; and formed
plastic bottles are made into pedal cranks. The prototype weighs 28
pounds, and can support a rider almost 20 times its weight. He intends to make
four models, two for adults and two for
children; rechargeable electric motors are optional. He hopes to sell
them for $30 each, and build them for $12 each.
If advertising were to be on each bike, then people
in developing countries could ride them for free.
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