Puzzle Designers Search for That ‘Satisfying Click’

For prizewinning puzzle creators, the devilish ideas are in the details.

By Siobhan Roberts

An Engine of Fossil Discovery Fights Its Own Extinction

A funding crisis at the Museum of the Earth and the Paleontological Research Institution in Ithaca, N.Y., could scatter priceless specimens and end nearly a century of pioneering research.

By Becky Ferreira and Kristian Thacker

the new old age

Older Americans Quit Weight-Loss Drugs in Droves

In some studies, half of patients stopped taking GLP-1s within a year despite the benefits, citing the expense and side effects.

By Paula Span

Trump May Give 775 Acres of a Federal Wildlife Refuge to SpaceX

In exchange for the land in Texas, the rocket and satellite company would give the government some of its own property nearby, documents show.

By Maxine Joselow

Lemon-Shaped World Is the Most Stretched-Out Planet Ever Seen

An unusual object orbiting a rapidly spinning star might be a new phenomenon in the universe.

By Jonathan O’Callaghan

Slain M.I.T. Professor Was Renowned and Respected Physicist

Nuno F.G. Loureiro, the professor, and the man suspected in his killing attended the same physics program in Portugal during the 1990s.

By Pooja Salhotra, Francesca Regalado, Azam Ahmed and Sarah Mervosh

Overlooked No More: Inge Lehmann, Who Discovered the Earth’s Inner Core

She pointed to evidence that the Earth’s inner core was solid — not liquid, as scientists had believed — a discovery that was ahead of its time.

By Dylan Loeb McClain

How Trump’s First Year Reshaped U.S. Energy and Climate Policy

The sweeping changes have affected everything from coal plant retirements to international diplomacy over shipping emissions.

By Brad Plumer, Lisa Friedman, Maxine Joselow and Scott Dance

A Somber Mood at Science Meeting as Trump Budget Cuts Continue

News of the breakup of a leading science institution rippled through an annual gathering of Earth, ocean and space scientists. Many say American science is suffering under the Trump administration.

By Eric Niiler

R.F.K. Jr. Likely to Swap U.S. Childhood Vaccine Schedule for Denmark’s

The shift would mean fewer shots recommended for children. But a Danish health official found the idea baffling, saying the United States was getting “crazier and crazier in public health.”

By Apoorva Mandavilli

Why the New Cannabis Classification Matters

Moving cannabis to a category of drugs that includes some common medicines will have implications for research, businesses and patients.

By Jan Hoffman

Trump Moves to End Gender-Related Care for Minors, Threatening Hospitals That Offer It

Proposed new rules would punish the hospitals by pulling all federal financing. Advocates say lawsuits will follow.

By Azeen Ghorayshi, Amy Harmon and Reed Abelson

Can Science Win on Social Media? Ask Dr. Noc.

Morgan McSweeney’s TikTok crusade against White House health policies has made him a star. It’s not a job he ever wanted.

By Erik Vance and Jesse Barber