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A curious harbor seal checks out diver Mike Weber as he and other divers pick up golf balls in the waters off the coast of Northern California. His daughter wrote a paper about all the golf balls found in the ocean from nearby golf courses. Courtesy of Alex Weber hide caption

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Courtesy of Alex Weber

Teenage Diver Finds Tons Of Golf Balls Rotting Off California

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President Trump called for a beefing up of existing defenses, such as the Aegis ashore system pictured. In addition, he called for research into new advanced concepts. Mark Wright/Missile Defense Agency hide caption

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Mark Wright/Missile Defense Agency

Trump Unveils Ambitious Missile Defense Plans

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Even something as simple as chopping up food on a regular basis can be enough exercise to help protect older people from showing signs of dementia, a new study suggests. BSIP/UIG/Getty Images hide caption

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BSIP/UIG/Getty Images

Daily Movement — Even Household Chores — May Boost Brain Health In Elderly

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The Best Medicine: Decoding The Hidden Meanings Of Laughter

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Surgeons performed more than 21,000 kidney transplants and 8,000 liver transplants in 2018, according the United Network for Organ Sharing. shapecharge/Getty Images hide caption

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shapecharge/Getty Images

A Surgeon Reflects On Death, Life And The 'Incredible Gift' Of Organ Transplant

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People were more likely to try mealworms — such as these mealworm chocolate truffles sprinkled with coconut — when the ad focused on taste and experience, a study showed. Oliver Brachat/for NPR hide caption

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Oliver Brachat/for NPR

A bit of lapis lazuli — a rich blue pigment — is trapped within a central tooth's dental tartar on this lower jaw of a European woman who died sometime between A.D. 997 and 1162. Christina Warinner/Science Advances hide caption

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Christina Warinner/Science Advances

A Blue Clue In Medieval Teeth May Bespeak A Woman's Artistry Circa A.D. 1000

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Prime Minister Narendra Modi (center) attends the opening of the 106th Indian Science Congress at Lovely Professional University on last week in Jalandhar, India. Pardeep Pandit/Hindustan Times via Getty Images hide caption

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Pardeep Pandit/Hindustan Times via Getty Images

As the economy boomed, emissions rose sharply in 2018. Shipping was one source of the increase. Mario Tama/Getty Images hide caption

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Mario Tama/Getty Images

U.S. Carbon Dioxide Emissions Are Once Again On The Rise

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