Israeli inventor Izhar Gafni has developed a bicycle made of cardboard, that he hopes will revolutionize Third World transport. According to a Reuters report, he estimates it can be sold - at a profit - for only $20, making it vastly cheaper than more conventional competitors.
Here's a video clip about how he developed his idea.
Having spent many years in the Third World, I can only say that if this holds up to wind and weather, it'll be a Godsend to many people in many nations. I'm frankly astonished that cardboard should be a suitable material for a bicycle - but seeing is believing!