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60 Countries to Meet on Phasing Out Fossil Fuels but Are Excluding the U.S.

LISA FRIEDMAN

The Trump administration was not invited to the gathering in Santa Marta, Colombia. A White House spokeswoman called the green transition “destructive.”

A New Bureau Will Oversee Both Offshore Drilling and Seabed Mining

SACHI KITAJIMA MULKEY

The new federal office will undo a change made after the 2010 Deepwater Horizon oil disaster. Critics say it could reduce environmental oversight.

The science behind the Adidas shoes that helped two marathoners break the two-hour mark

A sub-two-hour marathon has long been seen as a tantalizing benchmark for elite runners—and shoemakers have been in a race to design footwear that can help them get there

War in Iran spotlights the risk to drinking water for millions in the Persian Gulf

Direct attacks, oil spills and the threat of nuclear waste are putting the Gulf region's desalination plants at risk—here's why that matters

Polycystic ovary syndrome might affect men, too. Here’s how

A condition that affects 10 to 15 percent of women may affect men, too. But many doctors don't know about it

Targeted Hunts Were Supposed to Curb ‘Zombie Deer Disease.’ Now What?

JIM ROBBINS AND JULIA RENDLEMAN

In Illinois and other states, officials hoped that culls could halt the progress of chronic wasting disease. Now they are losing hope.

Watch Astrobotic’s latest record-breaking ‘ring of fire’ rocket engine test

Rotating detonation rocket engines work differently than traditional rockets to maximize thrust while using less fuel—an advantage that could help spacecraft explore farther in the solar system

Nick Pope, U.F.O. Sleuth Who Chased the Truth, Dies at 60

MICHAEL S. ROSENWALD

Often likened to Agent Mulder from “The X-Files,” he worked for Britain’s defense ministry and became a leading commentator on extraterrestrial matters.

Fusion energy company Commonwealth applies to join a U.S. power grid—a first

The fusion energy start-up Commonwealth aims to bring its first power plant online by the early 2030s, but daunting technical hurdles remain

Grand Jury Indicts Former N.I.H. Official

BENJAMIN MUELLER

Prosecutors accused Dr. David Morens, a former adviser to Dr. Anthony S. Fauci, of hiding records related to the onset of the pandemic.

The Simpsons reference that refutes one of history’s greatest mathematicians

In one famous episode of The Simpsons, Homer finds a counterexample to Fermat's last theorem

Humanity may be doomed to die in nuclear war—unless we act soon, physicist David Gross says

After winning a Breakthrough Prize, the world's most lucrative science award, theoretical physicist David Gross is using the moment to warn of nuclear war's existential threat—and how we can escape it

NASA chief Jared Isaacman hints at campaign to make Pluto a planet again

The NASA administrator's latest remarks in support of reexamining Pluto's status come 20 years after the orb was downgraded to a dwarf planet by the International Astronomical Union

City birds appear more afraid of women than men, and scientists have no idea why

"I fully believe our results, that urban birds react differently based on the sex of the person approaching them," said a co-author of a study that made this finding, "but I can't explain them right now"

Could At-Home Brain Stimulation Reduce Psychiatry’s Reliance on S.S.R.I.s?

RACHEL E. GROSS

A headset recently approved by the Food and Drug Administration uses a weak electric current to shock the brain. Some researchers hope it could challenge the current pill-centric paradigm.