Scientists have identified an area of the brain where damage seems to quickly halt a person's desire to smoke. (p. 51)

Newly designed nanoparticles could have dual benefits in the fight against cancer. (p. 45)

Researchers have genetically engineered hens that can not only produce useful drugs in their eggs but also reliably pass on this characteristic to new generations of chickens. (p. 35)

Researchers have tracked down a pair of genes that, together, seem responsible for some insects' ability to sense carbon dioxide. (p. 30)

Scientists have discovered a new type of stem cell in the fluid that bathes fetuses in the womb. (p. 30)

Scientists have developed a device that filters from blood the mutant proteins that cause the human form of mad cow disease, an advance that may hold promise for increasing the safety of donated blood. (p. 4)

A single swap in the letters of a gene's sequence could modify the protein it encodes, even if it doesn't change which amino acids make up the molecule. (p. 404)

Drastic limits on calorie consumption starting early in a monkey's life seemed to delay aging of the animal's immune systems in new research.Numerous studies have found that calorie restriction can extend the life span of organisms such as yeast, worms, fruit flies, and mice. However, scientists don't know how caloric restriction lengthens life.Janko Nikolich-Zugich of the Oregon Health and Science University in Beaverton, Ore., and his colleagues suspected that the immune system plays an important role. They worked with two groups of rhesus macaques. Starting just after puberty, monkeys in on... (p. 417)