Science Times: One Day There May Be a Drug to Turbocharge the Brain. Who Should Get It?

Plus: The Lost History of One of the World's Strangest Science Experiments —

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Benedicte Muller One Day There May Be a Drug to Turbocharge the Brain. Who Should Get It? By CARL ZIMMER A study found that a hormone meant to protect animals' brains actually enhanced them. Ethicists are wondering what happens if it becomes viable for humans.

Lars Fehlandt This Tarantula Became a Scientific Celebrity. Was It Poached From the Wild? By RACHEL NUWER Controversy over a new spider species has resurrected thorny ethical questions about scientists and their specimens. Robert DePalma/University of Kansas Fossil Site Reveals Day That Meteor Hit Earth and, Maybe, Wiped Out Dinosaurs By WILLIAM J. BROAD AND KENNETH CHANG A jumble of entombed plants and creatures offers a vivid glimpse of the apocalypse that all but ended life 66 million years ago. John Miller/Associated Press The Lost History of One of the World's Strangest Science Experiments By CARL ZIMMER The hummingbirds were dying. Cockroaches were everywhere. And then Steve Bannon showed up. Jonathan E. Kolby The Plague Killing Frogs Everywhere Is Far Worse Than Scientists Thought By CARL ZIMMER As a threat to wildlife, an amphibian fungus has become "the most deadly pathogen known to science." • Romeo and Juliet's First Date Marks New Hope for Endangered Frog

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Renaud Philippe for The New York Times He Helped Create A.I. Now, He Worries About 'Killer Robots.' By DAN BILEFSKY Still, Yoshua Bengio, an artificial intelligence pioneer and co-winner of this year's prestigious A.M. Turing prize, says A.I. will prove to be a boon, if regulated. • Turing Award Won by 3 Pioneers in Artificial Intelligence Martin Bernetti/Agence France-Presse — Getty Images Volcanoes! Lightning! And Radioactive Gas, Too By ROBIN GEORGE ANDREWS Studying radon's role in the electrification of plumes above volcanoes could help people anticipate the damage resulting from eruptions, scientists say. Alex Wild How Mosquitoes Sniff Out Your Sweat By VERONIQUE GREENWOOD Scientists have isolated a receptor that helps the bloodthirsty insects find you. Amy Metheny Injecting Marshmallow Peeps With Fungi, for Science By JOANNA KLEIN A mycologist hopes to show how a simple, silly experiment can illuminate fungal biology. Amanda Kelley/Agence France–Getty Images 'Scotty' the T. Rex Is the Heaviest Ever Found, Scientists Say By LAURA M. HOLSON The dinosaur was excavated in the Saskatchewan province of Canada in the 1990s. A recent study shows that it is the heaviest and oldest specimen of its kind. David J. Phillip/Associated Press The Trump Administration Wants Astronauts on Moon by 2024. But What's the Plan? By KENNETH CHANG The vice president called for greater urgency at NASA, but how the Trump administration intends to accomplish an ambitious moon landing was not clear.

What Termites Can Teach Us About Cooling Our Buildings By JOANNA KLEIN Saturn's Rings Are Sculpted by a Crew of Mini-Moons By NADIA DRAKE DNA Is Solving Dozens of Cold Cases. Sometimes It's Too Late for Justice. By CHRISTINE HAUSER Q&A How do bees find the flowers in the container garden on the fourth-floor deck of my city apartment? By C. CLAIBORNE RAY

Climate Change Cam Cottrill A Texan's Big Bet on a Fossil-Fuel Future for California By IVAN PENN AND THOMAS KAPLAN Andrew Beal, a poker-playing billionaire and major Trump backer, could upend California's carbon-free power goals with a case before federal regulators. Brandon Thibodeaux for The New York Times They Grew Up Around Fossil Fuels. Now, Their Jobs Are in Renewables. By JOHN SCHWARTZ AND BRANDON THIBODEAUX These are portraits of seven people working in wind and solar, industries their families hardly imagined they'd go into. But as one of them put it: "It's not ideology. It's just math." An Iceberg Twice the Size of New York City Is About to Split From Antarctica By JUGAL K. PATEL Scientists say the break could trigger further retreat of the Brunt ice shelf. Tim Gruber 'Breaches Everywhere': Flooding Bursts Midwest Levees, and Tough Questions Follow By MITCH SMITH, JOHN SCHWARTZ AND TIM GRUBER Hundreds of miles of levees in the Midwest have been overwhelmed by the floods, leaving "Swiss cheese" infrastructure and reigniting a flood control debate. • Deadly Floods Across Iran Leave Broad Paths of Destruction

SAY HI AND TELL US WHAT YOU THINK We welcome comments and suggestions at sciencenewsletter@nytimes.com.

Health Leah Klafczynski for The New York Times Transplant Patients Need Anti-Rejection Drugs. Why Won't Insurers Pay for Some of Them? By GINA KOLATA Drugs to prevent organ rejection are not always covered for patients who had transplants before they enrolled in Medicare. Gracia Lam Personal Health Brain Booster in a Bottle? Don't Bother By JANE E. BRODY To support brain health as you age, start with the same foods that can help to keep your heart healthy. Brendan Smialowski/Agence France-Presse — Getty Images What Happens if Obamacare Is Struck Down? By REED ABELSON, ABBY GOODNOUGH AND ROBERT PEAR The Affordable Care Act touches the lives of most Americans. Some 21 million could lose health insurance if the Trump administration were to succeed in having the law ruled unconstitutional. Mary Turner for The New York Times How Pain Tolerance and Anxiety Seem to Be Connected By HEATHER MURPHY An article about the case of a woman who feels little pain or anxiety raised many questions, such as: Do low-anxiety people seem to feel less pain? Madeline Gray for The New York Times Where There's Rarely a Doctor in the House: Assisted Living By PAULA SPAN As residents become older and more frail, some facilities are bringing in doctors and nurses instead of relying on 911. Getty Images What Your Exercise Habits Might Say About How Long You'll Live By GRETCHEN REYNOLDS If people start to exercise in midlife, even if they have not worked out for years, they can rapidly gain most of the longevity benefits of working out.

Ask Well Are my allergies all in my head? By RICHARD KLASCO, M.D. Lawsuits Lay Bare Sackler Family's Role in Opioid Crisis By DANNY HAKIM, RONI CARYN RABIN AND WILLIAM K. RASHBAUM How to Minimize Exposures to Hormone Disrupters By PERRI KLASS, M.D. Can What We Eat Affect How We Feel? By RICHARD SCHIFFMAN An Outbreak Spreads Fear: Of Measles, of Ultra-Orthodox Jews, of Anti-Semitism By SARAH MASLIN NIR AND MICHAEL GOLD Why Don't More American Men Get Vasectomies? By CHRISTINA CARON

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