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When is a snore just annoying and when is it a sign of sleep apnea? Luckily, they sound pretty different. Aleksandra Shutova / EyeEm/Getty Images/EyeEm hide caption

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Aleksandra Shutova / EyeEm/Getty Images/EyeEm

Beyond Annoying: How To Identify The Sounds Of A Troublesome Snore

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Parts of the Cape Fear River near Fayetteville, N.C., are contaminated with a PFAS compound called GenX. The North Carolina Department of Health and Human Services is surveying residents in the area about their health. Mark Wilson/Getty Images hide caption

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Mark Wilson/Getty Images

Scientists Dig Into Hard Questions About The Fluorinated Pollutants Known As PFAS

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A large new study finds mixed results for the effectiveness of programs aimed at motivating healthful behavior — such as more exercise and better nutrition — among employees. Erik Isakson/Getty Images/Tetra images RF hide caption

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Erik Isakson/Getty Images/Tetra images RF

CRISPR gene-editing technology allows scientists to make highly precise modifications to DNA. The technology is now starting to be used in human trials to treat several diseases in the U.S. Molekuul/Getty Images/Science Photo Library hide caption

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Molekuul/Getty Images/Science Photo Library

First U.S. Patients Treated With CRISPR As Human Gene-Editing Trials Get Underway

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A nurse prepares the measles, mumps and rubella vaccine at the Rockland County Health Department in Haverstraw, N.Y. Several measles outbreaks in New York state are contributing to this year's unusually high measles rates. Johannes Eisele/AFP/Getty Images hide caption

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Johannes Eisele/AFP/Getty Images

Measles Outbreak 'Accelerates,' Health Officials Warn

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The trick, of course, is to find moments of deep relaxation wherever you are, not just on vacation. Laughing with friends can be another way to start breaking the cycle of chronic stress and help keep your heart healthy, too. stock_colors/Getty Images hide caption

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High Stress Drives Up Your Risk Of A Heart Attack. Here's How To Chill Out

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Nurse practitioner Debra Brown guides patient Merdis Wells through a diabetic retinopathy exam at University Medical Center in New Orleans. Courtesy of IDx hide caption

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Courtesy of IDx

How Can We Be Sure Artificial Intelligence Is Safe For Medical Use?

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More than 285 cases of the measles have been reported in New York since October. Nearly all are associated with people who live in the Williamsburg or Borough Park neighborhoods of Brooklyn. Seth Wenig/AP hide caption

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Seth Wenig/AP

Shara and Robert Watkins hold their 5-month-old daughter, Kaiya, in their home in San Mateo, Calif., just after she had woken up from an afternoon nap. Lindsey Moore/KQED hide caption

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Lindsey Moore/KQED

Prenatal Testing Can Ease Minds Or Heighten Anxieties

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A new treatment for allergies is gaining popularity. Sublingual immunotherapy works to tame the immune response, much like allergy shots. Getty Images hide caption

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Getty Images

Seasonal Sniffles? Immunotherapy Tablets Catch On As An Alternative To Allergy Shots

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If a doctor's office is like Blockbuster, Hims feels more like Netflix. It's a way to skip the long waits and crowds and get generic Viagra, hair growth treatment and other medicine and vitamins with minimal interaction with a health care provider — for better and worse. PeopleImages/Getty Images hide caption

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PeopleImages/Getty Images

The presence of the hepatitis C virus in donated hearts and organs for transplantation wasn't an impediment for a successful result for recipients. Kateryna Kon/Getty Images hide caption

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Kateryna Kon/Getty Images

Hepatitis C Not A Barrier For Organ Transplantation, Study Finds

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Surprise bills happen when patients go to a hospital they think is in their insurance network but are seen by doctors or specialists who aren't. PeopleImages/Getty Images hide caption

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PeopleImages/Getty Images

A certified nursing assistant wipes Neva Shinkle's face with chlorhexidine, an antimicrobial wash. Shinkle is a patient at Coventry Court Health Center, a nursing home in Anaheim, Calif., that is part of a multicenter research project aimed at stopping the spread of MRSA and CRE — two types of bacteria resistant to most antibiotics. Heidi de Marco/KHN hide caption

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Heidi de Marco/KHN

"The optimist in me says in three years we can train this tool to read mammograms as well as an average radiologist," says Connie Lehman, chief of breast imaging at Massachusetts General Hospital in Boston. Kayana Szymczak for NPR hide caption

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Kayana Szymczak for NPR

Training A Computer To Read Mammograms As Well As A Doctor

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Oily fish such as salmon, sardines and lake trout, as well as some plant sources such as walnuts and flaxseed, can be good, tasty sources of omega-3 fatty acids. MinoruM/Getty Images hide caption

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MinoruM/Getty Images

Eating Fish May Help City Kids With Asthma Breathe Better

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Female mosquitoes searching for a meal of blood detect people partly by using a special olfactory receptor to home in on our sweat. Luis Robayo/AFP/Getty Images hide caption

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Luis Robayo/AFP/Getty Images

How Mosquitoes Sniff Out Human Sweat To Find Us

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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

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Nodar Chernishev/Getty Images

Blech! Brain Science Explains Why You're Not Thirsty For Salt Water

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A female adult head louse clings to a hair plucked from a human scalp. The brown line visible inside the insect, on the left side of its body, is its last blood meal. Lice typically eat a few times a day. Josh Cassidy/KQED hide caption

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Josh Cassidy/KQED