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A Yale University study analyzed the experience of 60 million Americans covered by traditional Medicare between 1999 and 2013, and found "jaw-dropping improvements in almost every area," the lead author says. Ann Cutting/Getty Images hide caption

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The sporting options in Finland are everywhere. Here, two people take advantage of the ice on Lake Hiidenvesi to get some exercise. Sami Uskela/Flickr hide caption

itoggle caption Sami Uskela/Flickr

At sign-up events like this one in Los Angeles in 2013, Covered California pledged "affordability" in health insurance as one of its main selling points. Lucy Nicholson/Reuters/Landov hide caption

itoggle caption Lucy Nicholson/Reuters/Landov

Coordinating care for high-risk patients was expected to save money and improve quality of care. A Medicare experiment didn't pan out. Roy Scott/Getty Images/Ikon Images hide caption

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A nanosecond pulsed laser beam starts the photoacoustic imaging process. Geoff Story/Courtesy of Washington University in St. Louis hide caption

itoggle caption Geoff Story/Courtesy of Washington University in St. Louis

Transgender performers walk backstage during an event to mark World AIDS Day in 2013. A new WHO report demonstrates extremely rates of HIV infection among transgender women in 15 countries. Prakash Mathema/AFP/Getty Images hide caption

itoggle caption Prakash Mathema/AFP/Getty Images

Despite losing his sense of taste and smell to Alzheimer's disease, Greg O'Brien says grilling supper on the back deck with his son on a summer evening is still fun. Sam Broun/Courtesy of Greg O'Brien hide caption

itoggle caption Sam Broun/Courtesy of Greg O'Brien

Christy O'Donnell, who has advanced lung cancer, is one of several California patients suing for the right to get a doctor's help with prescription medicine to end their own lives if and when they feel that's necessary. YouTube hide caption

itoggle caption YouTube