Jude Law prepares for the looming pandemic in the 2011 movie Contagion. There are huge differences between viruses in movies and Ebola in real life. Warner Bros/The Kobal Collection hide caption

itoggle caption Warner Bros/The Kobal Collection

Surgeons at Methodist University Hospital in Memphis prepare to transplant a liver in 2010. Karen Pulfer Focht/The Commercial Appeal/Landov hide caption

itoggle caption Karen Pulfer Focht/The Commercial Appeal/Landov

The heart beats in a mouse embryo grown with stem cells made from blood. Now the research that claimed a simple acid solution could be used to create those cells has been retracted. Courtesy of Haruko Obokata hide caption

itoggle caption Courtesy of Haruko Obokata

Antidepressant use nationally fell by 31 percent among adolescents between 2000 and 2010. Suicide attempts increased by almost 22 percent. JustinLing/Flickr hide caption

itoggle caption JustinLing/Flickr

Ed Damiano and his son David, 15, play basketball at home in Acton, Mass. Ed has invented a device he hopes will make David's diabetes easier to manage. Ellen Webber for NPR hide caption

itoggle caption Ellen Webber for NPR

Two cervical cancer cells divide in this image from a scanning electron microscope. Steve Gschmeissner/Getty Images/Science Photo Libra hide caption

itoggle caption Steve Gschmeissner/Getty Images/Science Photo Libra

A farmworker in Riyadh, Saudi Arabia, wears a mask to protect against Middle East respiratory syndrome earlier this month. The MERS virus is common in camels. Fayez Nureldine/AFP/Getty Images hide caption

itoggle caption Fayez Nureldine/AFP/Getty Images

U.S. Marine Sgt. Robert Scoggin gets a vaccination against smallpox in 2003 at Camp Pendleton in California — one of the final steps before deployment overseas. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images