This did not really happen. Cows' heads did not emerge from the bodies of people newly inoculated against smallpox. But fear of the vaccine was so widespread that it prompted British satirist James Gillray to create this spoof in 1802. Institute of the History of Medicine, Johns Hopkins University hide caption
Of parents who tell pollsters their teens have trouble sleeping, 23 percent say the kids are waking up at night worried about their social lives. A third are worried about school. All-night access to electronic devices only aggravates the problem, sleep scientists say. 3photo/Getty Images hide caption
Michel, joined on the couch by longtime pet Blade and service dog Lizzy, says at least three male service members assaulted or molested her between 1990 and 2005. Claire Harbage/NPR hide caption
John Gallagher in his truck in Fayetteville, N.C. "We've just been taking dispatch calls for swift water rescues, rescuing animals, missing persons," Gallagher said. Maddalena Richards/NPR hide caption
Because of a recent court decision, the size of the financial incentive your employer offers you in hopes of motivating you to lower your cholesterol or lose weight may soon shrink. Molly Cranna/Refinery29/Getty Images hide caption
Think you can get away with fewer than eight hours of sleep per night? Neuroscientist Matthew Walker says, think again. Sophie Blackall/Getty Images/Ikon Images hide caption
Walter Mischel, a psychologist who devised the marshmallow test, explained what it really means. Marcie LaCerte/NPR hide caption
Supreme Court nominee Judge Brett Kavanaugh during the second day of his Supreme Court confirmation hearing on Capitol Hill. Win McNamee / Getty Images hide caption
"If you do say, 'Yes, my child has seen a counselor or a therapist or a psychologist,' what does the school then do with that?" asks Laura Goodhue, who has a 9-year-old son on the autism spectrum and a 10-year-old son who has seen a psychologist. Andrea D'Aquino for NPR hide caption
Drinking water samples from homes in southwestern Puerto Rico are tested at Interamerican University of Puerto Rico in San German. Rebecca Hersher/NPR hide caption
Immature human eggs (pink) were created by Japanese researchers using stem cells that were derived from blood cells. Courtesy of Saitou Lab 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
Friend or foe? A California two-spot octopus (Octopus bimaculoides) gives observers the eye at the Marine Biological Laboratory in Woods Hole, Mass. Tom Kleindinst/Marine Biological Laboratory hide caption
According to the latest results from the Energy Information Administration, nearly a third of households in the United States have reported trouble paying their energy bills. Ponsulak Kunsub/Getty Images/EyeEm hide caption
Yogurt selections like this one at a Los Angeles 365 by Whole Foods Market store are getting larger, but a new U.K. study warns that many contain lots of added sugar. Patrick T. Fallon/Bloomberg via Getty Images hide caption
Preparing for a natural disaster becomes even more complicated when you're expecting. Thanasis Zovoilis/Getty Images hide caption
A Swiss study tracking the health of a group of children conceived via assisted reproductive technology found that a surprising number developed premature aging of their blood vessels. Now in their teens, 15 percent have hypertension. Steve Debenport/Getty Images hide caption
A World Food Programme convoy carries humanitarian aid to Aleppo, Syria. Getting food into conflict zones is a major hurdle — and a topic of discussion at the WFP's Innovation Accelerator. Cem Genco/Anadolu Agency/Getty Images hide caption
Lt. Ryan Snyder, who works at the Champaign County jail in Illinois, says it's hard for any such facility to provide the kind of one-on-one mental health treatment many inmates need. Christine Herman/Illinois Public Media hide caption
