Oscar Pistorius's blade-shaped prosthetics were the focus of much debate. The International Association of Athletics Federations ruled him inelgible to compete in the Olympics, claiming his false limbs were an unfair advantage. In May, the Court of Arbitration for Sport overturned the ruling, though Pistorius's time trials eventually failed to win him a spot on the South African team.
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.