TikTok is now U.S.-owned, but privacy risks remain. Learn what changed, what didn’t, and the exact settings to protect your account.

What’s the deal with iPhone Air battery life? Can a smartphone this thin actually last all day? Or at least, most of the day?

Protecting astronauts from the punishing effects of spaceflight has quietly become one of the most productive health experiments in history. In orbit, the human body ages faster, bones thin, muscles ...