NPR reported about an Israeli inventor who has designed a durable bicycle out of cardboard, even after his engineer friends told him it was impossible to do. It's funny to read the comments on the NPR page - people still don't believe him, even though he's proven it can be done. Watch this well-made and inspiring film about how he built the cardboard bike, tested it and perfected it!
Although Izhar's bike may not be the bike of everyone's dreams, if it really can be made for less than $20, then it could very well be a solution for some.
If you can dream it, you can build it and ride it. Thank you for your ingenuity, Izhar!