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Demonstrators gathered last month in front of the White House after President Trump rolled back many of President Obama’s climate-change policies. Stephen Crowley/The New York Times Scientists and Activists Look Beyond the March By NICHOLAS ST. FLEUR On Saturday scientists and their advocates are expected to fill streets in more than 500 cities. But what they do next is just as important.

Kim Raff for The New York Times The March for Science: Why Some Are Going, and Some Will Sit Out By MICHAEL ROSTON In remarks submitted The Times, some said the president’s posture toward science demanded a response, but others worried about the politicization of science. Underwood Archives/Getty Images ‘Genius’ Unravels the Mysteries of Einstein’s Universe By DENNIS OVERBYE A new series on the National Geographic Channel introduces viewers to the man behind the cuddly accent and the curvatures of space-time. Laura Morton for The New York Times A California Court for Young Adults Calls on Science By TIM REQUARTH San Francisco’s Young Adult Court, created in 2015, is based on recent research suggesting that brain development extends beyond age 18, into the 20s. Ruohong Wu The World’s Most Beautiful Mathematical Equation By RICHARD A. FRIEDMAN Math can make our brains light up in the same way art and music do.

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NASA/JPL-Caltech, via Space Science Institute Plumes From Saturn’s Moon Enceladus Hint That It Could Support Life By KENNETH CHANG Data from the Cassini spacecraft suggest that hydrothermal vents could provide ingredients for microbes or other forms of alien life to exist. Getty Images Do Your Shoelaces Keep Coming Undone? Engineers Explain Why By CHRISTOPHER MELE Blame physics and “weak” knots for unraveled laces, a phenomenon researchers called “sudden and catastrophic.” Gabriel Lio A Dinosaur Cousin’s Crocodile Ankles Surprise Paleontologists By NICHOLAS ST. FLEUR The features of 245-million-year-old Teleocrater fossils may help fill in our understanding of how dinosaurs evolved. Kristian Hammerstad New Tools Needed to Track Technology’s Impact on Jobs, Panel Says By STEVE LOHR The nation is “flying blind” into a new era of automation and artificial intelligence, the authors of a National Academies study warned.

Climate Change Dan Shugar/University of Washington-Tacoma Climate Change Reroutes a Yukon River in a Geological Instant By JOHN SCHWARTZ Melting water from one of Canada’s largest glaciers used to flow north, to the Bering Sea. Last spring, it reversed course, a case of what scientists call “river piracy.” Andres Cristaldo/European Pressphoto Agency It’s Like It Never Left: Another El Niño May Be on the Way By HENRY FOUNTAIN Just a year after weather patterns were altered worldwide, scientists see signs that more disruption may be brewing. Hiroko Masuike/The New York Times Scott Pruitt Faces Anger From Right Over E.P.A. Finding He Won’t Fight By CORAL DAVENPORT Critics charge the agency’s administrator should have challenged a legal finding that underpinned the Obama climate policies, but he refuses to budge. Christopher Miller for The New York Times More Permafrost Than Thought May Be Lost as Planet Warms By HENRY FOUNTAIN A study suggests that as the planet warms toward 2 degrees Celsius above preindustrial levels, each degree Celsius of warming will lead to the thawing of 1.5 million square miles of permafrost.

A Lizard With Scales That Behave Like a Computer Simulation By STEPH YIN Silver Fish Surf the Waves to Spawn on California Beaches By JOANNA KLEIN Saber-Toothed Cats Paid a Stiff Price for Lunch By NICHOLAS ST. FLEUR An Ice Scientist’s Worst Nightmare By TATIANA SCHLOSSBERG How Ants Figured Out Farming Millions of Years Before Humans By JOANNA KLEIN Q&A It’s spring and lots of birds are fighting over our solitary birdhouse. Who gets the lease? By C. CLAIBORNE RAY

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Health Getty Images Too Clean for Our Children’s Good? By PERRI KLASS, M.D. We need to study the health consequences of the modern and more “hygienic” built environment, which is clean but by no means sterile. Heidi Younger 6 Things I Learned About Ulcers By CATHERINE SAINT LOUIS Having an ulcer is like being a contestant on a twisted game show called “What to Eat?” Getty Images An Hour of Running May Add 7 Hours to Your Life By GRETCHEN REYNOLDS Runners tended to live about three more years than nonrunners, even if they run slowly or sporadically and smoke, drink or are overweight. Paul Rogers Personal Health The Cost of Not Taking Your Medicine By JANE E. BRODY Nonadherence to prescriptions causes some 125,000 deaths a year in the United States alone.

In a Dragon’s Blood, Scientists Discover a Potential Antibiotic By DONALD G. MCNEIL JR. Marathons: An Especially Bad Day for a Heart Attack By NICHOLAS BAKALAR Trans Fat Bans Tied to Fewer Heart Attacks and Strokes By NICHOLAS BAKALAR Heart Risks in Midlife Tied to Brain Plaques of Alzheimer’s By NICHOLAS BAKALAR

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