Relatives mourn before the funeral for family members who reportedly died by suicide at their home in Burari, India, this summer. Photo by Sanchit Khanna/Hindustan Times/Getty Images hide caption

"The biggest challenge for me was to see how I would be a father again," says Dr. Naveed Khan, who was injured while driving an all-terrain vehicle. "With two able-bodied parents at home, it was easier." Shelby Knowles for NPR hide caption

The people-plaguing Asian tiger mosquito, or Aedes albopictus, typically lays its eggs in stagnant water. James Gathany/AP hide caption

This adult Anopheles gambiae mosquito — the kind that spreads malaria — was genetically modified as part of the study. Andrew Hammond hide caption

James and Rosina Komape. In 2014, their 5-year-old son, Michael, fell in a pit latrine at school and drowned. Krista Mahr for NPR hide caption

Jean Couch, 75, perches on the edge of a chair at her home in Los Altos Hills, Calif. She teaches people the art of sitting in chairs without back pain. Erin Brethauer for NPR hide caption

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

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

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

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