In highly competitive House races that Democrats need to flip in November, the left is betting that calls for universal health care and taxing the wealthy will resonate — even among Republicans.

The government’s A.I. Security Institute, staffed by alumni from OpenAI and Google, is becoming a model for countries grappling with A.I.’s emerging risks.

Demand for security engineers has surged as artificial intelligence generates a glut of new code and models like Anthropic’s Mythos create new concerns.

A tough re-election race grew more daunting after President Trump backed Mr. Cornyn’s opponent, Ken Paxton. The Texas senator has vowed to fight to the end.

Luke Morrison may be the youngest person keeping alive an age-old tradition: to process war through the memories and mementos of those who experienced it.

Scientists shared transcripts with The Times in which chatbots described how to assemble deadly pathogens and unleash them in public spaces.