It can be satisfying to build something yourself, making careful measurements and ensuring your carefully routed wood slats fit together perfectly. Except when your measurements are off by a few microns and nothing fits. Some MIT students decided that a smart machine could help matters, and designed a re-routing router that automatically cuts the right shape.
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.