An experimental vaccine for hepatitis E has proved nearly 96 percent protective in a test in Nepalese soldiers. (p. 131)

For the first time, researchers have observed wild chimpanzees making and using tools to hunt other animals, a practice adopted mainly by adult females and youngsters. (p. 131)

A "carpet" of microscopic filaments sprayed onto a surface can prevent it from reflecting light, a potentially useful trait for technologies from solar cells to fiber-optic communications. (p. 132)

A snail that follows another snail's slimy path saves energy by not having to secrete so much mucus. (p. 132)

Twin spacecraft have for the first time tracked solar storms, known as coronal mass ejections, from their birth in the lower depths of the sun's atmosphere all the way to Earth's orbit. (p. 133)

Differences in the behavior and the brain receptors of rats seem to predict which of the rodents will become cocaine addicted. (p. 133)

At concentrations present in the environment, each of three dissimilar toxic agents can seize control of a signaling pathway that regulates developing cells in the central nervous system. (p. 134)

A 1-centimeter-long, 505-million-year-old fossil from British Columbia represents a creature that joins two lineages of marine invertebrates from that era that scientists previously hadn't linked. (p. 134)

A slate of experimental treatments, including three established diabetes drugs, could become medicines for nonalcoholic fatty liver disease, an obesity-related cause of cirrhosis. (p. 136)

Tight family groups of meerkats in Africa's arid lands offer a chance to see the costs, as well as the charms, of cooperation. With audio. (p. 138)

A portable sensor could make it possible to rapidly detect environmental uranium contamination. (p. 141)

New radiocarbon dates indicate that the Clovis people, long considered the first well-documented settlers of the New World, inhabited North America considerably later and for a much shorter time than previously thought. (p. 141)

A study of mice has identified a biological mechanism by which medications called atypical antipsychotics cause people to gain weight. (p. 141)

The theory of entanglement explains a newly observed behavior in a symmetrical hydrogen molecule: When the molecule fractures, the directions in which its constituent particles move are not always random. (p. 141)

Researchers have developed a technique to grow corneal tissue that includes nerve cells, an advance that may enable them to test consumer products in lab dishes rather than live animals. (p. 142)

The flow of water into and out of massive, ice-covered lakes in Antarctica may influence the speed at which the overlying glaciers move toward the sea. (p. 142)

Cocoa that retains compounds usually removed to soften the product's flavor can significantly improve blood flow to the brain. (p. 142)

Several varieties of fungi that attack hazelnuts produce high quantities of the popular cancer drug paclitaxel. (p. 142)

(p. 143)