Did you use training wheels when you learned to ride a bicycle? My dad was convinced they slowed down the learning process and taught bad habits, so he just held on to the back of the seat and ran down the street with me while I pedaled. Then he let go and I fell over. Rinse knees, repeat, until I caught on to the trick of keeping my balance.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.