A few minutes ago, an earthquake struck the East Coast of the U.S., centered near Richmond, Virginia, says the U.S. Geological Survey, which gave it a preliminary magnitude rating of 5.8 (just updated to 5.9). Tremors were felt all throughout the Mid-Atlantic and Northeast--the PopSci headquarters in Midtown Manhattan shook a bit, causing a minor nerd panic. No injuries or damage have been reported yet.
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.