Ken Paxton, the Texas attorney general and Republican Senate candidate, has alleged a sprawling profit-driven conspiracy. Pediatricians say the accusations are an attempt at intimidation.

An appellate court in Arizona threw out the prison sentence of a man convicted of manslaughter after an A.I.-generated video of his victim was played in court.

Manufacturers say they are close to perfecting a new, more efficient solar panel that could help the United States reclaim ground it lost.

The justices are about to hear a lawsuit that could determine whether the oil industry faces billions of dollars in liability for damages caused by global warming.

We asked 100 scientists about unsolved problems in their fields. They sent back provocations — on the origins of life, the possibilities for human progress and much more.