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Publisher's Summary

In this issue:

"Mystery Human": An astonishing trove of fossils has scientists, and the media, in a tizzy over our origins.

"The Puzzle of Dark Energy": Why is the expansion of the universe accelerating? After two decades of study, the answer is as mysterious as ever, but the questions have become clearer.

"Brain Drain": An internal plumbing system rids the brain of toxic wastes. Sleep is when this cleanup ritual occurs.

"Syria's Climate Refugees": Farmers who have escaped the embattled nation explain how drought and government abuse have driven social violence.

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