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(Left to right) Dark-eyed Junco, Eastern Meadowlark, Red-winged Blackbird Steven Mlodinow/EOL.org; Greg Lasley/EOL.org; dfwuw/EOL.org hide caption

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Steven Mlodinow/EOL.org; Greg Lasley/EOL.org; dfwuw/EOL.org

North America Has Lost 3 Billion Birds, Scientists Say

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Ric Peralta and his wife Lisa are both able to check Ric's blood sugar levels at any time, using the Dexcom app and an arm patch that measures the levels and sends the information wirelessly. Allison Zaucha for NPR hide caption

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Allison Zaucha for NPR

It's Not Just Insulin: Diabetes Patients Struggle To Get Crucial Supplies

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We're All Gonna Die! How Fear Of Death Drives Our Behavior

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Bridget Desmukes (center) and her husband, Jeffrey, love having a big, active family. "The kids are always climbing on things, flipping all the time — it's not dull," she says, laughing. Because Desmukes had developed preeclampsia in a previous pregnancy, her OB-GYN recommended low-dose aspirin at her first prenatal appointment this past spring. Ryan Kellman/NPR hide caption

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Ryan Kellman/NPR

A Daily Baby Aspirin Could Help Many Pregnancies And Save Lives

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These human embryo-like structures (top) were synthesized from human stem cells; they've been stained to illustrate different cell types. Images (bottom) of the "embryoids" in the new device that was invented to make them. Yi Zheng/University of Michigan, Ann Arbor hide caption

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Yi Zheng/University of Michigan, Ann Arbor

Scientists Create A Device That Can Mass-Produce Human Embryoids

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The EPA says it aims to eliminate the testing of chemicals and pesticides in animals by 2035. filo/Getty Images hide caption

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filo/Getty Images

EPA Chief Pledges To Severely Cut Back On Animal Testing Of Chemicals

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Joe Bay (center), coach of a New York City "Bootcamp for New Dads," instructs Adewale Oshodi (left) and George Pasco in how to cradle an infant for best soothing. Jason LeCras for NPR hide caption

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Jason LeCras for NPR

A gas flare from the Shell Chemical LP petroleum refinery illuminates the sky on Aug. 21 in Norco, La. Drew Angerer/Getty Images hide caption

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Drew Angerer/Getty Images

Opinion: Earth Has Survived Extinctions Before, It's Humans Who Are Fragile

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UK Biobank has granted 10,000 qualified scientists access to its large database of genetic sequences and other medical data, but other organizations with databases have been far more restrictive in giving access. KTSDESIGN/Getty Images/Science Photo Library hide caption

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KTSDESIGN/Getty Images/Science Photo Library

How Should Scientists' Access To Health Databanks Be Managed?

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The New York State Department of Health said Thursday that it is looking at vitamin E acetate as a potential cause of severe pulmonary illness cases in the state that have been associated with vaping. Daniel Becerril/Reuters hide caption

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Daniel Becerril/Reuters

The sounds of pleasant, relaxed bird chatter made eastern grey squirrels resume foraging more quickly after hearing the sounds of a predator, researchers found. Mike Kemp/In Pictures via Getty Images hide caption

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Mike Kemp/In Pictures via Getty Images

The Other Twitterverse: Squirrels Eavesdrop On Birds, Researchers Say

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Bags of heroin, some laced with fentanyl, picked up in a 2016 New York City drug bust. "Basically, [fentanyl] is so cheap to produce and it's so powerful, that drug dealers began realizing it was a way to increase their profits," Fentanyl, Inc. author Ben Westhoff says. But miscalculations of the amount used can be deadly. Drew Angerer/Getty Images hide caption

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Drew Angerer/Getty Images

Fentanyl As A Dark Web Profit Center, From Chinese Labs To U.S. Streets

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Researchers in the U.K. say a teen has suffered vision loss after years of eating a highly limited diet consisting of snacking on Pringles potato chips, as well as French fries, white bread and some processed pork products. Bloomberg via Getty Images hide caption

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Bloomberg via Getty Images

Blind From A Bad Diet? Teen Who Ate Mostly Potato Chips And Fries Lost His Sight

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The measles virus is highly contagious. If someone with measles coughs or sneezes, the virus in those droplets can survive for two hours afterward — infecting about 90% of the people lacking immunity who pass through that space. Erik Witsoe/EyeEm/Getty Images hide caption

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Erik Witsoe/EyeEm/Getty Images

Millennial And Gen-X Travelers: Need Another Measles Shot?

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Macrobdella mimicus, the first new species of medicinal leech discovered in over 40 years. The Smithsonian Institution hide caption

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The Smithsonian Institution

A New Bloodsucking Leech Species Found Hiding Outside Washington, D.C.

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Even if optimism doesn't come naturally, it can be taught, researchers say. Therapists can help you practice reframing your expectations, to cultivate a sunnier outlook. Roy Scott/Ikon Images via Getty Images hide caption

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Roy Scott/Ikon Images via Getty Images

Optimists For The Win: Finding The Bright Side Might Help You Live Longer

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UK Biobank, based in Manchester, England, is the largest blood-based research project in the world. The research project will involve at least 500,000 people across the U.K., and follow their health for next 30 years or more, providing a resource for scientists battling diseases. Christopher Furlong/Getty Images hide caption

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Christopher Furlong/Getty Images

UK Biobank Requires Earth's Geneticists To Cooperate, Not Compete

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The Australian federal government has downgraded its long-term outlook of the Great Barrier Reef to "very poor," and it says that climate change is the most significant threat. William West /AFP/Getty Images hide caption

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William West /AFP/Getty Images

Scientists say pea-size organoids of human brain tissue may offer a way to study the biological beginnings of a wide range of brain conditions, including autism, bipolar disorder and schizophrenia. Alysson Muotri/UC San Diego Health Sciences hide caption

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Alysson Muotri/UC San Diego Health Sciences

After Months In A Dish, Lab-Grown Minibrains Start Making 'Brain Waves'

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Among patients age 12 and older in a study of people with mild, persistent asthma, more than half did just as well, or better, on a placebo as they did on a steroid inhaler used twice per day to prevent symptoms. hsyncoban/Getty Images hide caption

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hsyncoban/Getty Images

Study Questions Mainstay Treatment For Mild Asthma

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Naked mole rats are eusocial, which means they live all crowded together, in a colony underground. Gregory G Dimijian/Getty Images/Science Source hide caption

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Gregory G Dimijian/Getty Images/Science Source