This is NASA's artist's rendition of the asteroid that struck Earth about four billion years ago. It was thought to have sterilized the planet due to heat, but a new study suggests that this was not the case--and that it may have even helped our planet along on its evolution to hosting life. Read more 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.