Michael Arnott, of Cambridge, Mass., says he used to have trouble staying awake on long drives. Sleep specialists discovered he has obstructive sleep apnea, though not for the most common reasons — he isn't overweight, and doesn't smoke or take sedatives.
M. Scott Brauer for NPR
Giedre (left) and Tal Cohen in March 2013, while Giedre was still healthy. Since then, she's begun having symptoms of Alzheimer's disease. In Giedre's case, the illness is tied to a rare genetic mutation she inherited.
Courtesy of Tal Cohen
In this colorized image of a brain cell from a person with Alzheimer's, the red tangle in the yellow cell body is a toxic tangle of misfolded "tau" proteins, adjacent to the cell's green nucleus.
Thomas Deerinck/NCMIR/Science Source
Joy (left, voiced by Amy Poehler) and Sadness (voiced by Phyllis Smith) catch a ride on the Train of Thought in Pixar's Inside Out. The movie opens in theaters nationwide June 19.
Kanzi the bonobo (a species closely related to chimps) holds a pan of vegetables he cooked at the Great Ape Trust in Des Moines, Iowa, November 2011. Kanzi was taught to cook. However, a new study is the first to show that animals can acquire a cooking-like skill on their own.
Laurentiu Garofeanu/Barcroft Media /Landov
The Allen Cell Types Database catalogs all sorts of details about each type of brain cell, including its shape and electrical activity. These cells, taken from the visual area of a mouse brain, are colored according to the patterns of electrical activity they produce.
Courtesy of Allen Institute for Brain Science
The ill-fated Sultana in Helena, Ark., just before it exploded on April 27, 1865, with about 2,500 people aboard. Most were Union soldiers, newly released from Confederate prison camps.
Library of Congress