Brain scans using Amyvid dye to highlight beta-amyloid plaques in the brain. Clockwise from top left: a cognitively normal subject; an amyloid-positive patient with Alzheimer's disease; a patient with mild cognitive impairment who progressed to dementia during a study; and a patient with mild cognitive impairment. Slide courtesy of the journal Neurology hide caption

itoggle caption Slide courtesy of the journal Neurology

Rufus, 46, now lives on an island in a Florida sanctuary run by Save the Chimps. Before his rescue, Rufus lived in a facility Save the Chimps calls "the dungeon." Courtesy of Save the Chimps hide caption

itoggle caption Courtesy of Save the Chimps

Chimpanzees check out a termite mound at the Chimp Haven sanctuary in Louisiana. Chimp Haven hide caption

itoggle caption Chimp Haven

For centuries, Russians believed putting a brown frog in their milk would keep it fresh. Now scientists are finding chemicals in the frog's slimy goo that inhibit the growth of bacteria and fungi. Stefan Arendt/Corbis hide caption

itoggle caption Stefan Arendt/Corbis

Does a little sugar water before shots really help ease a babies' pain? If only they could tell us. Dmitry Naumov/iStockphoto.com hide caption

itoggle caption Dmitry Naumov/iStockphoto.com

Dr. Ann McKee, professor of neurology and pathology of Boston University School of Medicine and co-director of the Veterans Affairs Center for the Study of Traumatic Encephalopathy, inspects a brain in the Bedford Veteran Medical Center last year. Stan Grossfeld/Boston Globe via Getty Images hide caption

itoggle caption Stan Grossfeld/Boston Globe via Getty Images

Pathologist Thomas Harvey took dozens of photos of Einstein's brain. This one shows that Einstein's prefrontal cortex (associated with higher cognition and memory) is unusually convoluted. On the right side of the brain there are four large ridges, where most people have only three. Brain(2012)/National Museum of Health and Medicine hide caption

itoggle caption Brain(2012)/National Museum of Health and Medicine

New research suggests that doctors who communicate online with their patients may not see a drop in office visits. iStockphoto.com hide caption

itoggle caption iStockphoto.com

The warmer orange colors show parts of the brain most active during improvisational rap. The blue regions are most active when rappers performed a memorized piece. NIDCD hide caption

itoggle caption NIDCD

The Beatles rehearse for that night's Royal Variety Performance at the Prince of Wales Theatre in 1963. Central/Hulton Achive/Getty Images hide caption

itoggle caption Central/Hulton Achive/Getty Images

The relationship between science and the government shifted dramatically in the wake of World War II, when the fruits of basic research resulted in an applied technology that changed the course of the war and world forever. Above, a nuclear explosion at the Trinity Site on July 16, 1945. Los Alamos National Laboratory hide caption

itoggle caption Los Alamos National Laboratory