Mark Bertolini, CEO of Aetna, told the Justice Department in July that the insurer would walk away from many health exchanges if the government opposed the company's proposed deal for Humana. On Tuesday, Aetna followed through. Andrew Harrer/Bloomberg via Getty Images hide caption

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Most people who say they've had a concussion say they sought out medical care at the time. Science Photo Libra/Getty Images hide caption

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Poll: Nearly 1 In 4 Americans Reports Having Had A Concussion

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Republican presidential candidate Donald Trump has unveiled a health care plan that starts with repealing Obamacare. Maddie McGarvey for The Washington Post/Getty Images hide caption

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Lipitor (atorvastain calcium) tablets made by Pfizer. PAUL J. RICHARDS/AFP/Getty Images hide caption

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What To Think About Conflicting Medical Guidelines

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For people 50 and older at a high risk for heart disease or stroke, an aggressive approach to treatment has advantages. But there are risks, too. iStockphoto hide caption

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Can you spot the four laundry pods? CR/John Powers and Ariana Salvato/Apotrophe/Courtesy of Consumer Reports hide caption

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