Jon Hamilton Jon Hamilton is a correspondent for NPR's Science Desk. Currently he focuses on neuroscience, health risks, and extreme weather.

Alzheimer's disease causes atrophy of brain tissue. The discovery that lymph vessels near the brain's surface help remove waste suggests glitches in the lymph system might be involved in Alzheimer's and a variety of other brain diseases. Alfred Pasieka/Science Source hide caption

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Alfred Pasieka/Science Source

Brain's Link To Immune System Might Help Explain Alzheimer's

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Scans Show Former NFL Player Aaron Hernandez Had A Severe Case Of CTE

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At Least 6 People Dead After Florida Nursing Home Loses Power

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Hurricane Center In Florida Keeps Watch Over Irma

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Hurricane Irma Heads Toward Miami As Forecasters Downgrade Storm To Category 4

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Simply going up in pitch at the end of a sentence can transform a statement into a question. Lizzie Roberts/Ikon Images/Getty Images hide caption

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Lizzie Roberts/Ikon Images/Getty Images

Really? Really. How Our Brains Figure Out What Words Mean Based On How They're Said

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Rats and people may rely on "metamemory" in a variety of different ways, scientists say. For a rat, it's likely about knowing whether you remember that predator in the distance; for people, knowing what we don't know helps us navigate social interactions. fotografixx/Getty Images/iStockphoto hide caption

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fotografixx/Getty Images/iStockphoto

From Rats To Humans, A Brain Knows When It Can't Remember

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Professional fighter Gina Mazany practices during a training session at Xtreme Couture Mixed Martial Arts in Las Vegas. She well remembers her first concussion — which came in her first fight. "I was throwing up that night," Mazany says. Bridget Bennett for NPR hide caption

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Bridget Bennett for NPR

Female Athletes Are Closing The Gender Gap When It Comes To Concussions

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Glioblastomas are the most common malignant brain tumor. About 12,000 people in the U.S. are diagnosed with the cancer every year. Sherbrooke Connectivity Imaging Lab/Science Source hide caption

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Sherbrooke Connectivity Imaging Lab/Science Source

John McCain Was Diagnosed With A Glioblastoma, Among The Deadliest Of Cancers

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New research finds that African-Americans who grow up in harsh environments and endure stressful experiences are much more likely to develop Alzheimer's or some other form of dementia. Leland Bobbe/Getty Images hide caption

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Leland Bobbe/Getty Images

Stress And Poverty May Explain High Rates Of Dementia In African-Americans

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Listen to the Invisibilia episode

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When the neurons that release the neurotransmitter dopamine die, people develop Parkinson's disease. Roger J. Bick &/Brian J. Poindexter / UT-Houston/Science Source hide caption

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Roger J. Bick &/Brian J. Poindexter / UT-Houston/Science Source

Brain Cell Transplants Are Being Tested Once Again For Parkinson's

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