Researcher John Clements in the early 1980s, after he figured out that lungs need surfactants to breathe. David Powers/Courtesy of UCSF hide caption

itoggle caption David Powers/Courtesy of UCSF

A woman receives the rVSV-ZEBOV Ebola vaccine at a clinical trial in Conakry, Guinea. The vaccine appears effective after only one shot. Cellou Binani/AFP/Getty Images hide caption

itoggle caption Cellou Binani/AFP/Getty Images

Healthy diets help prevent, even reverse, some health conditions. Dr. Dean Ornish believes it can also do the same for cancer. Courtesy of TED hide caption

itoggle caption Courtesy of TED

"We have 21st-century medical treatments and drugs to treat cancer, but we still have 20th-century procedures and processes for diagnosis," says Jorge Soto. James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

Mineral supplements, ape-style: A female chimp called Kana eats clay in the Budongo Forest of Uganda. A.Schel/Budongo Conservation Field Station/Animal Ecology, Utrecht University, The Netherlands hide caption

itoggle caption A.Schel/Budongo Conservation Field Station/Animal Ecology, Utrecht University, The Netherlands

The Ensatina salamander, a lungless species common along the U.S. West Coast, is one of hundreds of species of salamanders endemic to North America threatened by an emerging infectious pathogen. Courtesy of Tiffany Yap hide caption

itoggle caption Courtesy of Tiffany Yap

3-D renderings of four skeletons found buried near the altar of an early church in the Jamestown settlement in Virginia. Smithsonian X 3D hide caption

itoggle caption Smithsonian X 3D

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

itoggle caption Ann Cutting/Getty Images

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

A daily habit of sugary-sweetened drinks can boost your risk of developing the disease — even if you're not overweight. Ryan Kellman/NPR hide caption

itoggle caption Ryan Kellman/NPR