Dr. Tom Frieden (left), director of the Centers for Disease Control and Prevention, testifies about Zika virus with Dr. Anthony Fauci (center), director of the National Institute of Allergy and Infectious Diseases, and Dr. Ariel Pablos-Mendez, assistant administrator of the U.S. Agency for International Development's Bureau for Global Health, on Capitol Hill on Feb. 10. Nicholas Kamm/AFP/Getty Images hide caption
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
How do some of the most respected investors on the planet think Americans should be investing their money? Alyson Hurt/NPR hide caption
Jump off a roof? Ride a bike while texting? Well, what do you think? iStockphoto hide caption
A protester outside the White House demands a halt to all flights to the United States from West Africa. Mladen Antonov /AFP/Getty Images hide caption
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
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
I told him he would break his arm if he did that. But he did it anyway. iStockphoto.com hide 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
Kids who can't resist temptation early on may have trouble with it throughout their lives. iStockphoto.com hide caption
