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U.S. Marines fire the Carl Gustav rocket system during live-fire training last October. With each firing, the shooter's brain is exposed to pulses of high pressure air emanating from the explosion that travel faster than the speed of sound. Sgt. Aaron Patterson/3rd Marine Division/DVIDS hide caption

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Sgt. Aaron Patterson/3rd Marine Division/DVIDS

Report To Army Finds Blast From Some Weapons May Put Shooter's Brain At Risk

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Paige Vickers for NPR

Probiotics For Babies And Kids? New Research Explores Good Bacteria

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Lorena Bradford (left), head of accessible programs at the National Gallery of Art in Washington, D.C., leads a session of the museum's Just Us program. The program gives adults with memory loss and their caregivers a chance to explore and discuss works of art in a small-group setting. Lynne Shallcross/KHN hide caption

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Lynne Shallcross/KHN

Scientists placed two clusters of cultured forebrain cells side by side (each cluster the size of a head of a pin) in the lab. Within days, the minibrains had fused and particular neurons (in green) migrated from the left side to the right side, as groups of cells do in a real brain. Courtesy of Pasca lab/Stanford University hide caption

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Courtesy of Pasca lab/Stanford University

Tiny Lab-Grown 'Brains' Raise Big Ethical Questions

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Pfizer's Celebrex painkiller posed no more risk of heart or stroke than ibuprofen or naproxen in a large study. Daniel Acker/Bloomberg via Getty Images hide caption

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Daniel Acker/Bloomberg via Getty Images

FDA Panel Affirms Safety Of Painkiller Celebrex

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A sample of cannabidiol (CBD) oil is dropped into water. Supplements containing the marijuana extract are popular and widely sold as remedies for a variety of ailments and aches. But scientific evidence that they work hasn't yet caught up for most applications, researchers say. Stefan Wermuth/Bloomberg Creative Photos/Getty Images hide caption

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Stefan Wermuth/Bloomberg Creative Photos/Getty Images

Anxiety Relief Without The High? New Studies On CBD, A Cannabis Extract

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Catherine Fitzgerald, the author's mother, spent four nights in a hospital after falling in her home. But Medicare refused to pay for her rehab care, saying she had only been an inpatient for one night. Alison Kodjak/NPR hide caption

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Alison Kodjak/NPR

The Centers for Disease Control and Prevention says a recent E. coli outbreak is linked to romaine lettuce grown in Yuma, Ariz. At least 53 people have reported illnesses, 31 have been hospitalized. David Goldman/AP hide caption

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David Goldman/AP

Ogechi Ukachu, one of the registered nurses recently hired to help staff D.C.'s "Right Care Right Now" program, takes a training call at the city's 911 call center. Selena Simmons-Duffin/NPR hide caption

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Selena Simmons-Duffin/NPR

Can Triage Nurses Help Prevent 911 Overload?

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Researchers used a gene-carrying virus to fix blood stem cells that were then used to treat patients with beta-thalassemia. Power and Syred/Science Photo Library/Getty Images hide caption

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Power and Syred/Science Photo Library/Getty Images

How do we make sense of all that chatter? Ilana Kohn/Getty Images hide caption

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Ilana Kohn/Getty Images

How People Learned To Recognize Monkey Calls Reveals How We All Make Sense Of Sound

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