A thousand years ago, Changbai-Paektu volcano exploded, blanketing thousands of square kilometers of Eastern Asia in ash and pumice in what was one of the largest eruptions of the past few millennia. Today, located on what is now the border of North Korea and China, the volcano is showing signs of life once again. In September 2011, two British volcanologists joined North Korean scientists on a expedition to the volcano's crater to test monitoring equipment and foster international collaboration. Accompanying the volcanologists was Science's Richard Stone, who provides a first-hand account of the trip in a News Focus article and a full-length photo slide show in the 4 November issue.
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