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SN Online

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12:31pm, April 4, 2013

BECOMING HUMAN
Learn how people have been driving species to extinction since the Stone Age in a new column by Erin Wayman.

LIFE
Wild insects are a key to bigger harvests. See “Native pollinators boost crop yields worldwide.”

SCIENCE & SOCIETY
By tracking tweets, researchers identify communities. Read “Twitter maps New York City, language by language.”

BODY & BRAIN
In developing rat and monkey brains, cells called microglia prune excess growth. See “Immune cells chow down on living brain.”

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