The magma that feeds volcanoes beneath Earth’s surface is a mix of solid particles, liquid melt and gas bubbles. Successfully predicting whether lava from an erupting volcano will ooze out slowly or in a sudden and potentially deadly explosion has long vexed scientists.

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Stephen Sestanovich
Before the Russia-U.S. summit in Helsinki, Russia expert Steve Sestanovich assessed the Trump-Putin relationship, and what they seek from one another.

Researchers set out four microphones like this one in the foothills of Alaska's Brooks Range to record songbird calls over five breeding seasons. In a new study, they describe an automated tool for sifting through thousands of hours of recordings to estimate when migratory birds arrive en masse in the Arctic. (Photo credit: Heather Greaves)

In a new study, scientists describe a way to quickly sift through thousands of hours of field recordings to estimate when songbirds arrive at their Arctic breeding grounds. Their research could be applied to any dataset of animal vocalizations to understand how migratory animals are responding to climate change.
Mae Ngai
Author of the award-winning book 'Impossible Subjects: Illegal Aliens and the Making of Modern America,' Ngai is an authority on immigration, citizenship, nationalism, and U.S. legal and political history.
Charles Armstrong
Armstrong is the Korea Foundation Professor of Korean Studies in the Social Sciences at Columbia and the author of five books on the two countries.