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After scientists screened over 8,000 genes in fruit flies, only one, which hadn't been described before, triggered sleepiness. Andrew Syred/Science Source hide caption

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Andrew Syred/Science Source

Frank Lettiere's eyebrows and eyelashes froze after his walk along Lake Michigan's Chicago shoreline Wednesday. Frostbite warnings were issued for parts of the U.S. Midwest as temperatures plunged. Joshua Lott/AFP/Getty Images hide caption

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Joshua Lott/AFP/Getty Images

Medical Effects Of Extreme Cold: Why It Hurts And How To Stay Safe

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A British study found that people who used e-cigarettes to quit smoking were more successful than those who tried nicotine patches and gum. Dan Kitwood/Getty Images hide caption

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Dan Kitwood/Getty Images

Study Found Vaping Beat Traditional Smoking-Cessation Options

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Sen. Kamala Harris, D-Calif., at an Oakland, Calif., campaign rally this week. Harris says she backs a single-payer health system, but she hasn't yet offered details on how she would finance that plan. Mason Trinca/Getty Images hide caption

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Mason Trinca/Getty Images

"There's a certain notion that e-cigarettes are harmless," says Dr. Paul Ndunda, an assistant professor at the School of Medicine at the University of Kansas in Wichita. "But ... while they're less harmful than normal cigarettes, their use still comes with risks." RyanJLane/Getty Images hide caption

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RyanJLane/Getty Images

Anthem Blue Cross of California, one of the state's largest health insurers, is battling Sutter Health over how much it should pay the company's 24 hospitals and 5,000 doctors in Northern California to care for tens of thousands of patients. David McNew/Getty Images hide caption

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Ariel Davis for NPR

From Fruit Fly To Stink Eye: Searching For Anger's Animal Roots

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Matt Gleason fainted at work after getting a flu shot, so colleagues called 911 and an ambulance took him to the ER. Eight hours later, Gleason went home with a clean bill of health. Later still he got a hefty bill that wiped out his deductible. Logan Cyrus for KHN hide caption

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Logan Cyrus for KHN

A Fainting Spell After A Flu Shot Leads To $4,692 ER Visit

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To tame your anger, it may help to take time to observe and name it. Ariel Davis for NPR hide caption

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Ariel Davis for NPR

Got Anger? Try Naming It To Tame It

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Children of Mexican immigrants wait to receive a free health checkup inside a mobile clinic at the Mexican Consulate in Denver, Colo., in 2009. The Trump administration wants to ratchet up scrutiny of the use of social services by immigrants. That's already led some worried parents to avoid family health care. John Moore/Getty Images hide caption

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Fear Of Deportation Or Green Card Denial Deters Some Parents From Getting Kids Care

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Skeletal muscle cells from a rabbit were stained with fluorescent markers to highlight cell nuclei (blue) and proteins in the cytoskeleton (red and green). Daniel Schroen, Cell Applications Inc./Science Source hide caption

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Daniel Schroen, Cell Applications Inc./Science Source

The drugs clonazepam and diazepam are both benzodiazepines; they're better known by the brand names Klonopin and Valium. The drug class also includes Ativan, Librium and Halcion. Bloomberg/Getty Images hide caption

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Dr. Paul Davis, whose daughter, Elizabeth Moreno, was billed $17,850 for a urine test and featured in KHN-NPR's Bill of the Month series, was among the guests invited to the White House on Wednesday to discuss surprise medical bills with President Trump. Julia Robinson for KHN hide caption

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Julia Robinson for KHN

Chronic pain is just one health concern women can struggle with after giving birth. Some who have complicated pregnancies or deliveries can experience long-lasting effects to their physical and mental health, researchers find. Mirko Pradelli/EyeEm/Getty Images hide caption

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Mirko Pradelli/EyeEm/Getty Images

Juul Labs, the maker of e-cigarettes popular with young, has come under fire from health officials. Since the spring of 2018 the company has been lobbying the federal government. Gabby Jones/Getty Images hide caption

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Gabby Jones/Getty Images