High-fat diets decrease the ability of male rats to learn and remember. (p. 302)

Sleep apnea may be a risk factor for attention-deficit hyperactivity disorder. (p. 302)

Breathing minuscule amounts of painkillers administered to patients in surgery may increase an anesthesiologist's risk of abusing prescription drugs. (p. 302)

The antiacne drug Accutane may decrease activity in a part of the brain that regulates mood. (p. 302)

Young mice exposed to a common type of antidepressant, known as a selective serotonin reuptake inhibitor (SSRI), showed symptoms of anxiety and depression in adulthood. (p. 278)

New evidence supports the theory that Mexican blind cavefish are sightless by evolutionary selection, not chance. (p. 270)

Variations in a single gene may have dramatically increased the virulence of 1918 Spanish flu. (p. 269)

A type of DNA once thought to be little more than genetic clutter may play a role in gene expression in mammalian eggs and newly formed embryos. (p. 243)

Bone marrow–derived cells linger in skin wounds much longer than previously thought, aiding in healing. (p. 206)

A new study suggests that the common fruit fly has cells that function much as those in the human pancreas do. (p. 180)

Staphylococcus bacteria prefer to get their iron from heme, the ring-shaped portion of oxygen-carrying proteins such as hemoglobin. (p. 190)

Scientists have identified what might be a new class of cancer-controlling genes that alternates between halting and promoting cancer. (p. 149)