Nobody's implying that it's right around the corner, but an old question is on a lot of people's minds these days -- especially you readers.
How will the world end?
Wikipedia has a nice list of some possible scenarios.
What's your favorite? Discuss in the comments.
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.