Dawn of Social Networks

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The Hadza, one of the last remaining populations of hunter-gatherers on the planet, provide clues about social networks and the evolution of cooperation.
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Physician Referrals on the Rise

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Physician referral rates in the United States doubled between 1999 and 2009, an increase that likely contributes to the rising costs of health care.
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‘Pulverized’ Chromosomes and Cancer

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Researchers describe a mechanism by which chromosomes stranded outside the nucleus are damaged, resulting in cancer-causing gene mutations.
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Damage from MS May Be Reversible

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Researchers have found that the deterioration of the protective covering surrounding nerve fibers in conditions such as multiple sclerosis (MS) may be reversible.
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Molecular Motor Does the ‘Silly Walk’

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A tiny motor tasked with shuttling vital payloads throughout the cell’s intricate highway infrastructure staggers like a drunken sailor.
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stethoscope: iStockphoto/Daft Lion Studio