News

Health & Medicine

Harmless bacterium edges out intestinal germ

Researchers treated C. difficile infections in mice with a closely related bacteria that blocks C. difficile growth.

Genetics

Men who lose Y chromosome have high risk of cancer

Losing the Y chromosome in blood cells may bring on cancer and shorten men’s lives.

Plants

How female ferns make younger neighbors male

Precocious female ferns release a partly formed sexual-identity hormone, and nearby laggards finish it and go masculine.

Genetics

Easter Islanders sailed to Americas, DNA suggests

Genetic ties among present-day populations point to sea crossings centuries before European contact with Easter Island.