North Korea dropped a bomb underground yesterday, conducting its third successful nuclear test since 2006 and creating a small seismic event. The explosion was about twice as large as the last test, in 2009, though the bomb is thought to have been made with plutonium, and not the much scarier uranium. U.S. officials…

According to reports from the U.S. Geological Survey, there was a small, 4.9 magnitude earthquake in North Korea late on Monday. The tremor's epicenter was reportedly near North Korea's previous nuclear test sites, where devices were detonated in 2006 and 2009, fueling rumors that the quake was the result of a nuclear…