Hair from ancient mammoths contains enough genetic material to permit reconstruction of parts of the animal's genome. (p. 195)

Mosquito nets treated with insecticides decrease death rates among children in Kenya's malarial zones. (p. 195)

Kelp, algae that grow in cold water, turn out to be surprisingly widespread in tropical seas. (p. 196)

By depleting an essential amino acid and releasing a toxin, cancer cells can ward off attack by the immune system. (p. 196)

Bacteria that flew on a space shuttle became deadlier than their earthbound counterparts. (p. 197)

Thimerosal, a mercury-containing vaccine preservative, shows no signs of causing memory, attention or other problems in children. (p. 197)

Rock from Hawaii was fashioned into a stone tool found in Polynesian islands more than 4,000 kilometers to the south, indicating that canoeists made the sea journey around 1,000 years ago. (p. 198)

The remarkable strength and electrical properties of graphene, a chicken-wire network of carbon atoms, make it a promising new material for computer chips. (p. 200)

The toxicity of a chemical that leaches from a widely used plastic receives conflicting evaluations in two new reviews. (p. 202)

A single atom on a surface has favored magnetic orientations that could allow it to encode a data bit. (p. 205)

Nanoparticles in diesel fumes thwart proteins that dissolve blood clots, perhaps increasing the risk of heart attacks. (p. 205)

Honeybees gang up on an attacking hornet, killing it by blocking its breathing. (p. 205)

Rice with an added gene needs less water and can survive drought. (p. 205)

Blurry images yield estimates of the true width of glowing meteor vapor trails in Earth's upper atmosphere. (p. 205)

The malaria parasite's reliance on a sugar in the gut of mosquitoes may offer a way to block the disease's transmission. (p. 206)

A constituent of green tea rescues brain cells damaged in a way that mimics the effect of Parkinson's disease. (p. 206)

An amino acid in tea combines with the brew's caffeine to enliven brain cells that aid concentration. (p. 206)

(p. 207)