In the future, you may be able to play Simon Says with a robot. The Korean Institute of Science and Technology (KIST) and Samsung Electronics have unveiled Mahru, a bipedal machine that uses motion-capture technology to mimic human movements in real time. When you wave your arms, he waves his arms. If you do the moonwalk, he'll do his best — at the moment, Mahru's legs lag a little.
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.