The upshot from a study of more than 75,000 low-risk births is that "childbirth in the United States is very safe regardless of where you decide to do it," says Dr. Michael Greene, who directs obstetrics at the Massachusetts General Hospital in Boston. Photofusion/UIG via Getty Images hide caption

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Data sources: David Ropeik/Harvard University, National Weather Service, World Health Organization, Northeastern University Laboratory for the Modeling of Biological and Socio-Technical Systems, National Geographic, United States Census Adam Cole and Ryan Kellman/NPR hide caption

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The cruise ship Carnival Magic floats behind a catamaran off Cozumel, Mexico on Oct. 17. The ship skipped a planned stop there Friday, the cruise line says, after Mexican authorities delayed granting permission to dock. Reuters/Landov hide caption

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I told him he would break his arm if he did that. But he did it anyway. hide caption

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Whether or not you'll someday get cancer or any disease can feel like a roll of hundreds of dice. Calculating the odds --€” and knowing what they mean --€” is tricky. Katie Harbath/Flickr hide caption

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Kids who can't resist temptation early on may have trouble with it throughout their lives. hide caption

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