News

Health & Medicine

Bird flu viruses may infect mammary glands more commonly than thought

H5N1 turning up in cow milk was a big hint. The virus circulating in U.S. cows can infect the mammary glands of mice and ferrets, too.

Environment

Federally unprotected streams contribute most of the water to U.S. rivers

A 2023 U.S. Supreme Court ruling that ephemeral streams aren’t protected by the Clean Water Act could have sizable ripple effects, a study suggests.

Cosmology

Strange observations of galaxies challenge ideas about dark matter

A new look at how light bends as it travels through the universe could point to an alternative theory of gravity.