After seeing his dog try and fail to gnaw through a stalk of bamboo in 1996, Craig Calfee of Calfee Design introduced a line of bike frames made out of bamboo and hemp as a publicity stunt. Since then the California company has produced about 100 bamboo frames, each starting at $2,695. Calfee describes bamboo as "tougher than carbon fiber in terms of impact resistance. It's less prone to fracturing than carbon fiber, and the bamboo bike is about one pound heavier than carbon fiber." For more info: www.calfeedesign.com; The Bamboo Bike Project at Columbia University is exploring the feasibility of bamboo bikes as a sustainable form of transportation in Africa, www.earth.columbia.edu.