Joy Reynolds of San Diego looks at the newspapers on display at the Newseum in Washington, D.C., on June 29, 2012, following the Supreme Court ruling on President Obama's health care law. David Goldman/AP hide caption

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Dr. Nayna Patel performs an ultrasound exam on Rinku Macwan, at a hospital near Ahmedabad, India. It's illegal in India for doctors to reveal a baby's sex during these exams, but many do it anyway. Sam Panthaky/AFP/Getty Images hide caption

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A worker stands on top of a storage bin on July 27, 2011, at a drilling operation in Claysville, Pa. The dust is from powder mixed with water for hydraulic fracturing. Keith Srakocic/AP hide caption

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A new study from the Centers for Disease Control and Prevention finds no link between the number of vaccinations a young child receives and the risk of developing autism spectrum disorders. Jeff J. Mitchell/Getty Images hide caption

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Taxes this year will be as much of a drag as ever. But not because of the Affordable Care Act. hide caption

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Leslie Morgan Steiner shares her story of domestic abuse at TEDxRainier. TED hide caption

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Philip Zimbardo explains his infamous Stanford Prison experiment at a TED conference. Andrew Heavens/Courtesy of TED hide caption

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TED Radio Hour

Philip Zimbardo: Why Do Good People Do Bad Things?

Philip Zimbardo knows how easy it is for nice people to turn bad. In this TED talk, Zimbardo explores the nature of evil and how easy it is to be a hero.

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David Oliver sits quietly as he waits for the results of a scan at Ellis Fischel Cancer Center in Columbia, Mo., in 2012. The University of Missouri research professor was diagnosed with cancer in September 2011. He broke the news to colleagues via a video on the Internet. Jeff Roberson/AP hide caption

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Particles of the hepatitis C virus are imaged with an electron microscope. James Cavallini/Science Source hide caption

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A microscopic image of prostate cancer. Researchers have found new genetic markers that flag a person's susceptibility to the disease, as well as breast and ovarian cancer. Otis Brawley /National Cancer Institute hide caption

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