Overcoming obstacles, scientists have created stable embryonic stem cells from rats. Researchers hope their method will prove useful as a general recipe for isolating stem cells from other mammals.

Cumulative effects of phthalates and related compounds likely larger than effects measured one chemical at a time, reports a National Research Council panel.

An antibiotic produced by a bacterium acts as a molecular snorkel to help with breathing. The bacterium infects and kills many people with cystic fibrosis, and plugging the snorkel could lead to treatments. (p. 8)

Just expecting to feel better can sometimes cure what’s ailing you.