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Just a 10 percent shift in the salt concentration of your blood would make you very sick. To keep that from happening, the body has developed a finely tuned physiological circuit that includes information about that and a beverage's saltiness, to know when to signal thirst. Nodar Chernishev/Getty Images hide caption

Scientists are questioning the evidence about an alleged attack on diplomats at the U.S. Embassy in Havana. Ramon Espinosa/AP hide caption

Given supportive, nurturing conditions, highly reactive "orchid" children can thrive when tackling challenges, pediatrician and author Thomas Boyce says, especially if they have the comfort of a regular routine. Michael H/Getty Images hide caption

Person undergoing a CAT scan in hospital with PET scan equipment. Emerging studies report findings of brain deterioration in females to be slower than that of males'. Johnny Greig/Getty Images hide caption

A scanning electron micrograph shows microglial cells (yellow) ingesting branched oligodendrocyte cells (purple), a process thought to occur in multiple sclerosis. Oligodendrocytes form insulating myelin sheaths around nerve axons in the central nervous system. Dr. John Zajicek/Science Source hide caption

Researchers say human brains can become overwhelmed by cute traits, such as large eyes and small noses, embodied by movie characters like Bambi. Disney Junior/Disney Channel via Getty Images hide caption

Before light reaches these rods and cones in the retina, it passes through some specialized cells that send signals to brain areas that affect whether you feel happy or sad. Omikron /Getty Images/Science Source hide caption

In experiments involving people with epilepsy, targeted zaps of the lateral orbitofrontal cortex region of the brain helped ease depressive symptoms. Getty Images hide caption

Patients awaiting epilepsy surgery agreed to keep a running log of their mood while researchers used tiny wires to monitor electrical activity in their brains. The combination revealed a circuit for sadness. Stuart Kinlough/Ikon Images/Getty Images hide caption

How does the brain's working memory actually work? Jon Berkeley/Ikon Images/Getty Images hide caption

The cerebellum, a brain structure humans share with fish and lizards, appears to control the quality of many functions in the brain, according to a team of researchers. Science Source hide caption

"We have only begun to scratch the surface of the complex problems inherent in figuring out ... the brain's inner workings," said Paul Allen in 2012. Kum Kulish/Corbis/Getty Images hide caption

The fix was in for this rhesus macaque drinking juice on the Ganges River in Rishikesh, Uttarakhand, India. No gambling was required to get the reward. Fotofeeling/Getty Images/Westend61 RM hide caption

Scientists at Johns Hopkins University are studying barn owls to understand how the brain maintains focus. Meredith Rizzo/NPR hide caption

Jazz legend Billie Holiday at a recording session in 1957. Holiday's pioneering vocal style played with tempo, phrasing and pitch to stir hearts. Michael Ochs Archives/Getty Images hide caption

Several circular herpes virus particles are seen near a cell membrane. Roseola herpes virus causes a childhood illness marked by skin rashes and now has been found in brains with Alzheimer's disease. NCI/Science Source hide caption

Marines based in Okinawa, Japan, fire an M136 AT-4 rocket launcher as part of a weapons training exercise on the Kaneohe Bay Range Training Facility, in 2014. Lance Cpl. Matthew Bragg/U.S. Marines/DVIDS hide caption

Scientists placed two clusters of cultured forebrain cells side by side (each cluster the size of a head of a pin) in the lab. Within days, the minibrains had fused and particular neurons (in green) migrated from the left side to the right side, as groups of cells do in a real brain. Courtesy of Pasca lab/Stanford University hide caption

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