Heart patients who get transfusions of donated blood that's kept more than 14 days fare worse than patients who get fresher blood. (p. 179)

Alone in the animal kingdom, these crustaceans signal their presence to potential mates with circularly polarized light. (p. 179)

Male zebra finches sing slightly differently when serenading a female as opposed to twittering to themselves, and females react to those differences. (p. 180)

A new link between insulin and aging adds to scientists' understanding of longevity and points to possible targets for life-extending therapies. (p. 180)

Astronomers move closer to understanding how life arose on Earth and how it could arise elsewhere. (p. 181)

A reactive chemical in urban air cleans up some pollutants but could introduce another. (p. 181)

New software pinpoints the weak spots in Michelangelo's David. (p. 182)

A tiny aquatic plant, once thought to be related to grasses, raises new questions about the evolution of the earliest flowering plants. (p. 182)

Researchers are beginning to identify neural components of insightful problem solving, though no scientific consensus exists on how the brain mediates "light-bulb" or "Aha!" moments. (p. 184)

Recent surveys of the shapes, colors, and masses of galaxies have put a new focus on the nitty-gritty of galaxy formation—the complicated physics of the interaction of gas. (p. 186)

An extra copy of one gene slims down tomatoes. (p. 189)

A protein linked to Alzheimer's disease may help young people forget, too. (p. 189)

Researchers have discovered what could be a new class of drugs for treating animals afflicted with nematodes. (p. 189)

Sphinx moths appear to remember experiences they had as caterpillars, suggesting some brain cells remain intact through metamorphosis. (p. 189)

A new neutron detector might help identify smuggled radioactive materials. (p. 190)

Peeling off adhesive tape can be frustrating, and now researchers know why. (p. 190)

Cell phone data shows that people's daily roaming follows statistical patterns also seen in predators. (p. 190)

(p. 191)