Last week was a busy one for the Comprehensive Test Ban Treaty Organization, a detection agency set up to identify nations when they test nuclear weapons banned by treaty. On Tuesday, the organization's seismographs detected a rumble in North Korea that could only have been an atomic test. Then on Friday, CTBTO infrasound sensors picked up an explosion over Russia, but this time, it wasn't a nuclear test.
A meteorite streaked through the sky Friday morning, exploding over central Russia. Plant your eyeballs here for the latest updates. 3:15 p.m. EST:Russia Today writes that the estimated cost of damage has been revised down from 1 billion rubles to 400 million rubles, or about $13 million.
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.