Research hasn't delivered a definitive answer on whether fish oil and Vitamin D supplements have health benefits, but it's clear that eating fish is beneficial. Enn Li Photography/Getty Images hide caption

FDA Commissioner Scott Gottlieb said he wants to ban menthol cigarettes because teenagers often become addicted to nicotine by smoking them. Joe Raedle/Getty Images hide caption

"Everything is private information, stored on your computer or a computer you designate," says George Church, genetics professor at Harvard Medical School, about the approach of Nebula Genomics. Craig Barritt/Getty Images for The New Yorker hide caption

Clinicians and first responders who care for victims of gun violence can suffer what's called vicarious trauma. Image Source/Getty Images hide caption

Chase Kulakowski, 3, contracted the polio-like condition known as acute flaccid myelitis in 2016. Two years later, his mother isn't sure he will ever recover. He's seen on his bed at home in Dyer, Ind., in October. Armando L. Sanchez/Chicago Tribune/TNS via Getty Images hide caption

Helping a spouse or parent who has dementia steer clear of hazards can include ridding the home of all guns. Nicole Xu for NPR hide caption

Humans would do better to accept many of the life forms that share our space, than to scrub them all away, says ecologist Rob Dunn. Basic Books hide caption

Getting physical activity every day can help maintain health throughout your life. Ronnie Kaufman/Larry Hirshowitz/Getty Images/Blend Images hide caption

Protestors holding pictures of people who died from use of paint removers, including Drew Wynne, protest outside a Portland, Maine, Lowe's store on May 10, 2018. They were trying to persuade the retailer to stop selling paint strippers containing methylene chloride. Ben McCanna/Portland Press Herald via Getty Images hide caption

Taking fish oil supplements to prevent cardiovascular disease and cancer may not be effective, a new study suggests. Cathy Scola/Getty Images hide caption

Nicole and Ben Veum, with their little boy, Adrian. Nicole was in recovery from opioid addiction when she gave birth to Adrian, and she worried the fentanyl in her epidural would lead to relapse, but it didn't. Adam Grossberg/KQED hide caption

There's been an increase in vaping in teens, but e-cigarette manufacturers say it's a safer alternative to smoking. Martina Paraninfi/Getty Images hide caption

Mourners comfort each other Thursday during a vigil at the Thousand Oaks Civic Arts Plaza for the victims of the mass shooting at Borderline Bar and Grill in Thousand Oaks, Calif. Kevork Djansezian/Getty Images hide caption

Researchers followed a group of kids from childhood into adulthood to track the link between trauma in early life and adult mental health. fzant/Getty Images hide caption

Join us for a webcast on life and health in rural America. From The Forum at Harvard T.H. Chan School of Public Health. Courtesy of Harvard T.H. Chan School of Public Health hide caption

Services like rides to the doctor or wheelchair ramps are among those that some Medicare Advantage plans will begin to offer next year. Razvan Chisu / EyeEm/Getty Images/EyeEm hide caption

Montana Gov. Steve Bullock, a Democrat, warned that failure of a Medicaid-funding initiative on the ballot could make for a tough legislative session in 2019. William Campbell/Corbis via 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

Researchers say it's too soon to say if marijuana could help humans with Alzheimer's, but experiments in mice showed some effects. MmeEmil/Getty Images hide caption