Columbia University

When the Sahara turned to sand

The Sahara wasn't always a desert. Trees and grasslands dominated the landscape from roughly 10,000 years ago to 5,000 years ago. Then, abruptly, the climate changed, and north Africa began to dry out.

dateNov 11, 2013 in Earth Sciences
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What songbirds can teach us about the brain

(PhysOrg.com) -- Professor Sarah Woolley does research on males who mate for life and help out around the home. If you asked where these creatures can be found, she might direct your attention outdoors.

dateFeb 23, 2011 in Neuroscience
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A Texas-sized block of ice

The first dedicated Antarctic Icepod mission was flown out across the center of the Ross Ice Shelf. Ice shelves are thick floating extensions of the ice sheet that form as the ice flows off the continent ...

dateDec 05, 2014 in Earth Sciences
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Pumping draws arsenic toward a big-city aquifer

Naturally occurring arsenic pollutes wells across the world, especially in south and southeast Asia, where an estimated 100 million people are exposed to levels that can cause heart, liver and kidney problems, ...

dateSep 11, 2013 in Environment
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