It’s been a great day for interplanetary H2O. First we hear that Mars was once covered in a massive, deep ocean. Now scientists at the Carnegie Institution's Geophysical Laboratory are reporting that the moon may harbor 100 times more water than previously thought.
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.