What better way to celebrate the romance of Valentine's Day than watching a supercomputer robot defeat Jeopardy!'s two greatest champions in a man-on-machine trivia throwdown? Gather your significant other; strap him or her to a couch if you need to, because this is important. Tonight, the first round of a very special Jeopardy! tournament begins.
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.