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

toggle caption Adam Cole and Ryan Kellman/NPR

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

toggle caption Reuters/Landov

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

toggle caption

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

toggle caption Katie Harbath/Flickr

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

toggle caption

NPR thanks our sponsors

Become an NPR sponsor