Purdue University has a fun simulator called Impact Earth that shows you what would happen if a particular kind of meteorite smashed down from space. Plug in some info about the meteorite you'd like to simulate--size, composition, angle and speed of impact--and then check out the precise kind of havoc it would wreak. We've written about it before, but it somehow seems more pressing now. Maybe because of this little thing. Try Impact Earth here.
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.