“Izhar Gafni has designed a bike that weighs 20 pounds, costs between $9-12 to build, can hold up to a 485 pound person, and it made out of cardboard.

Engineers told Gafni that his idea was impossible. Yet he realized that paper could be strong if treated properly. As in crafting origami and tearing telephone books, he explains, “[if] you fold it once, and it’s not just twice the strength, it’s three times the strength.”

via Kottke.org