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Trump Sharply Scales Back Fuel Economy Rules for New Cars

BRAD PLUMER AND MAXINE JOSELOW

The move marked the final step in the administration’s efforts to dismantle policies aimed at speeding the shift to electric vehicles.

New Cancer Drugs Are Revolutionary. Why Don’t More Patients Get Them?

GINA KOLATA

Targeted gene therapies are highly effective at stopping cancers, but the very abundance of the treatments, plus cost and sluggish change, are hindering access.

Archeologists unearth a ‘major’ early Christian monastery in Scotland

The site, located on the island of Lismore, may have been established by Saint Mo Luóc in the sixth century C.E.

How climate change is altering petrichor, the glorious smell after it rains

As the planet changes, so will this nostalgia-triggering scent

Democratic Michigan Senate hopeful Abdul El-Sayed explains how science influences his politics

Scientific American spoke to the Michigan Senate candidate about how his background in medicine has shaped his outlook

Scientists are decoding elephant rumble calls, including ‘greetings’ and ‘coos’

Scientists are piecing together why elephants make these low calls and what they might mean

Google tests its plan for AI data centers in space with Project Suncatcher

Today Project Suncatcher is sending four AI processors into orbit on a SpaceX rocket to see whether the building blocks of a data center can survive space

Scientists discover that Earth’s crust has repeatedly rolled over—and it’s still happening

An analysis of ancient sea-level changes reveals that the whole solid Earth has shifted multiple times

Prosecutors Cannot Revive Reflecting Pool Case Against Ex-Olympian, Judge Rules

CLARENCE WILLIAMS

A charge against David Hearn was dismissed “with prejudice” because of President Trump’s attempts to influence the case.

Cornell’s Jane Doe Said She Was Given Ketamine. Here’s How the Drug Works.

ANDREW JACOBS

Ketamine is a short-acting anesthetic that can have hallucinogenic effects. It is becoming more easily available, and some experts fear misuse is increasing.

How Did Christa Pike Survive Two Lethal Injections of Pentobarbital?

BENJAMIN MUELLER

A catheter carrying the drug may not have delivered the doses to Ms. Pike’s bloodstream, experts said. The drug itself may have been degraded.

States Sue Over Trump’s Repeal of Climate Rules for Power Plants

BRAD PLUMER

The mostly Democratic-led states say that the E.P.A. acted unlawfully when it erased Biden-era limits on carbon dioxide from coal- and gas-fired plants.

Google’s Project Suncatcher AI data center test has officially launched to space onboard SpaceX rocket

Project Suncatcher is aimed at testing Google's AI chips in the harsh environment of space

The MacArthur ‘Genius’ Studying Sea Ice Secrets

CLAIRE BROWN

A climate scientist was one of 20 recipients of a “no-strings-attached” $800,000 stipend.

Anthropic’s Quest for Humanlike A.I.

ELIZABETH DIAS, CADE METZ, CHRISTINA SHAMAN, CHRIS WHITWORTH, STEPHANIE SWART, WHITNEY SHEFTE AND MARK OLTMANNS

Elizabeth Dias, our national religion correspondent, and Cade Metz, one of our technology reporters, discuss Anthropic’s approach for instilling morality into Claude — which has involved consultations with religious leaders, including ones at the Vatican — and why it’s raising questions.