Trawling the Web looking for that last minute costume idea today? Look no further. NASA engineer Mark Rober has a “relatively simple” (we’re calling it relatively expensive) yet technologically elegant solution to your Halloween wardrobe woes. All you need is two iPad 2s, some fake blood, and a shirt that you no longer care for.
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.