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Unless you replenish fluids, just an hour's hike in the heat or a 30-minute run might be enough to get mildly dehydrated, scientists say. RunPhoto/Getty Images hide caption

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Off Your Mental Game? You Could Be Mildly Dehydrated

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Wren Vetens was promised a significant discount on the cost of her gender-confirmation surgery if she paid in cash upfront, without using her health insurance. Yet afterward, Vetens received an explanation of benefits saying the hospital had billed her insurer nearly $92,000. Lauren Justice for KHN hide caption

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Lauren Justice for KHN

Bill Of The Month: A Plan For Affordable Gender-Confirmation Surgery Goes Awry

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Sarah Gonzales for NPR

Marines Who Fired Rocket Launchers Now Worry About Their Brains

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Describing how pain affects your daily activities may be more effective than the standard pain scale. Lynn Scurfield for NPR hide caption

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Lynn Scurfield for NPR

Words Matter When Talking About Pain With Your Doctor

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Sleep Scientist Warns Against Walking Through Life 'In An Underslept State'

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UCLA researchers are using a radioactive tracer, which binds to abnormal proteins in the brain, to see if it is possible to diagnose chronic traumatic encephalopathy in living patients. Warmer colors in these PET scans indicate higher concentrations of the tracer. UCLA hide caption

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More Screen Time For Teens Linked To ADHD Symptoms

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Justin Volz for ProPublica

Health Insurers Are Vacuuming Up Details About You — And It Could Raise Your Rates

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Heat Making You Lethargic? Research Shows It Can Slow Your Brain, Too

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When the heart pushes too hard, as it does when blood pressure is elevated, it can cause damage that can lead to a stroke, says Dr. Walter Koroshetz. John Rensten/Getty Images hide caption

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Worried About Dementia? You Might Want to Check Your Blood Pressure

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