Cool Aha Moment: The Cardboard Bicycle [Inc.]

cardboard bicycle
The number of assumptions involved in designing any product is staggeringly large, and usually fundamental. Take bikes. You know they'll probably be made out of some kind metal, whether aluminum or steel, unless you're talking about the very expensive racing types built from lightweight carbon fibers.
Would you believe cardboard?
An Israeli entrepreneur has apparently pulled off a prototype bicycle made of recycled cardboard, according to the Israeli blog Newsgeek (via TheNextWeb). Yes, that sounds nuts. How could a cardboard bike support an adult rider?