Here’s why farmers and scientists are concerned over the New World screwworm’s unwelcome return to the United States.

A week after OpenAI made headlines with an A.I.-generated proof, a new “declaration” by 16 experts raises concerns that the technology threatens math as a discipline.

The claim that their loved ones’ deaths and disappearances are linked is almost certainly false — but the loss remains real.

By tracking eye movements in zebrafish, researchers identified four different types of sleep, analogous to the complex sleep patterns of humans and other animals.