A new policy raises questions about testosterone’s effect on aggression in some men.

Hundreds of bases are contaminated with PFAS, which are linked to low birth weight and other risks. Politicians from both parties are demanding explanations.

© Nina Riggio for The New York Times

Hundreds of bases are contaminated with PFAS, which are linked to low birth weight and other risks. Politicians from both parties are demanding explanations.

Workers at the artificial intelligence company have been puzzled and increasingly concerned by the administration’s move to limit their latest A.I. models.

The administration’s surprise restrictions Friday cut off foreign access to Anthropic’s latest models and sparked another round of finger pointing.

More than 100 planned wind farms in 21 states are now stalled indefinitely as the Pentagon delays military reviews once seen as routine.

More than 100 planned wind farms in 21 states are now stalled indefinitely as the Pentagon delays military reviews once seen as routine.

© Brandon Thibodeaux for The New York Times

The Netherlands blocked a U.S. company from buying a Dutch firm that handles its national ID system, saying it would create a “threat to the public interest.”

The claim that their loved ones’ deaths and disappearances are linked is almost certainly false — but the loss remains real.