Science Times: Their Children Were Conceived With Donated Sperm. It Was the Wrong Sperm.

Plus: Why Crocodiles Are Not Just Living Fossils —

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Peter Horvath Their Children Were Conceived With Donated Sperm. It Was the Wrong Sperm. By JACQUELINE MROZ As genetic testing becomes more widespread, parents are finding that sperm used in artificial insemination did not come from the donors they chose.

SpaceX After SpaceX Starlink Launch, a Fear of Satellites That Outnumber All Visible Stars By SHANNON HALL Images of the Starlink constellation in orbit have rattled astronomers around the world. DeepMind DeepMind Can Now Beat Us at Multiplayer Games, Too By CADE METZ Chess and Go were child's play. Now A.I. is winning at capture the flag. Will such skills translate to the real world? Wael Hamzeh/EPA, via Shutterstock 'Screen Time' Is Over By BENEDICT CAREY The phrase can't remotely capture our ever-shifting digital experience, social scientists say. Say hello to the "screenome." Patrick Kovarik/Agence France-Presse — Getty Images Why Crocodiles Are Not Just Living Fossils By ASHER ELBEIN They've changed remarkably over millions of years, and at one point may even have been warmblooded.

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The Shorebirds of Delaware Bay Are Going Hungry By JON HURDLE AND MICHELLE GUSTAFSON On their migrations north, famished birds stop to feast on eggs laid by horseshoe crabs. But the crabs were overfished, and conservationists say that some bird species may not recover. Juniors Bildarchiv GmbH/Alamy Why Gulping Down a Cold Drink Feels So Rewarding By VERONIQUE GREENWOOD In a study of mice, researchers found no links between the neural systems related to reward and monitoring water intake. Royal Observatory, Greenwich Celebrating the Eclipse That Let Einstein Shine By SIOBHAN ROBERTS Before 1919, cosmology was as subjective as art criticism. A solar eclipse, and a patent clerk's equations, changed everything. Hulton Archive/Getty Images Fighting the Gender Stereotypes That Warp Biomedical Research By JOANNA KLEIN Female animals were once deemed too hormonal and messy for science. Some scientists warn it's not enough to just use more female lab rats. Illustration by Radio How to Attract Butterflies By MALIA WOLLAN Find nine square feet. Mix native milkweeds and nectar plants. No chemicals. Mizumoto et al. A School of Fish, Captured in a Fossil By LUCAS JOEL A slab of rock and the methods used to study it could offer clues to when a behavior common in fishes first evolved. HBO Plenty of Fantasy in HBO's 'Chernobyl,' but the Truth Is Real By HENRY FOUNTAIN Ahead of the series finale, a science writer who has toured the site of the 1986 nuclear disaster weighs in. • Interactive: Capping a Catastrophe Robert A. Smith, via Australian Opal Center He Was Looking for Opals. Instead He Found a New Dinosaur Species. By JAMIE TARABAY AND GENEVIEVE JIA LING FINN Scientists reported the discovery in Australia of a plant-eating species, 35 years after a miner brought fossils to a museum in Sydney.

These Mole Rats Felt No Pain, Even From Wasabi's Burn By CARA GIAIMO A Signal in Giant Earthquakes That Could Save Lives By ROBIN GEORGE ANDREWS Exploring the Animal 'Supernavigators' That Can Fly 56,000 Miles a Year By FRANS DE WAAL Q&A To keep things in my ice chest cold, should I drain the cold water as the ice melts or leave it in the chest? By C. CLAIBORNE RAY

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Climate Change Antoine Maillard If Seeing the World Helps Ruin It, Should We Stay Home? By ANDY NEWMAN In the age of global warming, traveling — by plane, boat or car — is a fraught choice. And yet the world beckons. Niranjan Shrestha/Associated Press As Everest Melts, Bodies Are Emerging From the Ice By BHADRA SHARMA AND KAI SCHULTZ Climbers and the Nepalese government believe the recently exposed bodies are the result of global warming, which is rapidly melting the mountain's glaciers.

Health Travis Dove for The New York Times How Much Does Your Education Level Affect Your Health? By AUSTIN FRAKT Some clever studies have teased out causal effects by taking advantage of natural experiments. iStock When Social Media Is Really Problematic for Adolescents By PERRI KLASS, M.D. Underlying problems may make some young people particularly vulnerable to what they find on social media, an expert says. Gracia Lam Personal Health A Pioneering Treatment for Uncontrollable Hunger By JANE E. BRODY A special diet and growth hormones may offer hope for children with Prader-Willi syndrome. William Chambers for The New York Times A Drug Prolonged Life in Younger Women With Advanced Breast Cancer By DENISE GRADY Adding a newer medicine to the standard hormonal treatment helped women who had not reached menopause or were still going through it. Jeenah Moon for The New York Times Dog Owners Get More Exercise By GRETCHEN REYNOLDS Dog owners spent close to 300 minutes each week walking with their dogs, about 200 more minutes of walking than people without dogs. Hiroko Masuike/The New York Times Six Simple Barre Stretches to Try on Vacation By TARA PARKER-POPE No matter where you are in the world, you can always find something to lean on so you can stretch your muscles.

Ask Well As a middle-aged male, does marathon running transiently increase my risk for cardiac arrest? By GRETCHEN REYNOLDS Cannabis Companies Push F.D.A. to Ease Rules on CBD Products By SHEILA KAPLAN Measles Cases Reach Highest Level in More Than 25 Years, C.D.C. Says By LIAM STACK An Experimental Ebola Cure May Also Protect Against Nipah Virus By DONALD G. MCNEIL JR.

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