Alexander Naddour, of the U.S. men's gymnastics team, bears the circular mark of cupping on his right arm as he prepares to compete on the pommel horse at the Rio de Janeiro Olympics on August 6. Alex Livesey/Getty Images hide caption

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Alex Livesey/Getty Images

Science writer Jo Marchant investigated the healing power of the mind for her new book, Cure. Jutta Kuss/Getty Images hide caption

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Jutta Kuss/Getty Images

How Meditation, Placebos And Virtual Reality Help Power 'Mind Over Body'

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When people see charts like this, they think the drug is more effective than if they just read about the data, a study finds. Source: Cornell University hide caption

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Source: Cornell University