A new mode includes a study tool, but it still does a user’s homework. And a children’s safety nonprofit says the chatbot flunked its tests.

Experts say that after childbirth, intrusive thoughts are common and mostly benign. Lindsay Clancy’s story provides a disturbing exception.

More light at the day’s end comes at a price: much later winter sunrises across much of the U.S. Scientists have documented consequences for public health and the economy.

This popular term is often misused, experts say, which may cause more harm than good.

Internal documents show how tech giants grabbed children’s attention throughout the day, a strategy that schools say has undermined education.