New research on monkeys vaccinated against HIV's relative SIV calls into question an idea that has driven AIDS vaccine work for years. The assumption: a protective vaccine only needs to stimulate moderate levels of antibodies that neutralize the virus.

Until now only known for role in polyglutamine diseases, such as Huntington's.

Nutrient-rich water from melting Antarctic glaciers nourishes the ocean food chain, creating feeding "hot spots" in large gaps in the sea ice, according to a new study.