New research has uncovered a social world full of cheating, cooperation, and other intrigues, suggesting that viruses make sense only as members of a community.

A vast constellation of celebrities, from Kelly Ripa to the McDonald’s mascot Grimace, have helped push dairy sales.

A trial vaccine has succeeded in generating low levels of antibodies needed to target HIV. It’s a first but much-needed step toward preventing infection.

A store in Singapore is selling lab-grown chicken, but it contains only 3 percent animal cells.

Users receiving weekly injections saw their weight fall, plateau, and stabilize over the course of a four-year trial—but it’s still unclear how long these effects last after stopping taking the drug.

The preliminary results of a clinical trial of using heat exposure to combat depression are in—and are fueling cautious optimism that sauna practice could become an accepted treatment.