High-tempo Special Operations training can cause brain injuries that accumulate unnoticed. One soldier says that is why he snapped and killed three people.

Nikki Glaser returned as host and killed, while Teyana Taylor delivered the speech of the night. Then there were those awful production choices.

The former F.B.I. deputy director, who had hosted a right-wing, pro-Trump podcast, will restart the show after a rocky tenure at the law-enforcement agency.

Apple was facing increasing questions about its plans for artificial intelligence as other big tech companies invested tens of billions in the technology.

The Massachusetts senator signaled alarm about her party’s movement toward the center, warning in a speech that Democrats should not cozy up to the wealthy and the powerful.

Rose Byrne, Owen Cooper, Seth Rogen, Teyana Taylor and other award winners in the spotlight.

A fragile democracy, the Weimar Republic, briefly took hold in Germany before the Nazis seized power. Now, Weimar’s collapse is seen as a warning.