A large study finds you may share about a quarter of your oral and gut microbes with the people you live with. Should you worry? We asked the experts.

The U.S. may be the world's biggest producer of crude oil, but that's not the case for motor oil. The cost of lubricants is soaring, and even a tentative deal to end the war won't solve the problem.

New albums by Lizzo and the rising artist Imani Imani are both "event" records — but one arrives with arguably too much backstory, the other with almost none.