Scientists have devised a method for identifying cocaine's geographical origin by determining the chemical signatures of five distinct coca-growing regions in the Andes. (p. 324)

Analyses of the isotope ratios of carbon and oxygen in hundreds of samples of Greek marble may help researchers identify the quarries that supplied the stone for some of Europe's most famous statues and architecture. (p. 324)

Tiny steel-mesh tubes coated with a DNA-containing polymer could prevent arteries from becoming reclogged after cardiovascular treatment. (p. 325)

Contrary to the fears of some researchers, treatment delays for schizophrenia may not worsen brain deficits associated with the mental disorder. (p. 325)

Biologists studying wild tobacco and sagebrush say they have found a case of interspecies plant communication in the field. (p. 326)

A flickering cosmic mirage, recorded for the first time in X rays, promises to provide a new estimate of how rapidly the universe is expanding. (p. 326)

Consuming lots of oranges and other citrus fruits, or their juices, can trigger beneficial, cholesterol-moderating changes in the blood. (p. 327)

Pressure imprints made by a person in a chair provide a new type of computer input useful for tracking posture or, perhaps, other clues to someone's activities and state of mind. (p. 327)

High-temperature superconductivity makes a bid for the power grid. (p. 330)

Fireworks erupt over an extension of rules to protect lab animals. (p. 334)

Astronomers have for the first time witnessed two giant storms merging on Jupiter. (p. 328)

Still reeling from the failure of its two most recent missions to Mars, NASA announced late last month that it would delay by nearly a decade plans to bring back samples from the Red Planet. (p. 328)

Results from polymerase chain reaction experiments challenge the existence of ultratiny microbes called nanobacteria. (p. 328)

A mutant gene confers resistance to chloroquine upon parasites that cause malaria. (p. 328)

A new study links the traffic associated with urban sprawl to an unexpectedly large rain of air pollutants entering local waters. (p. 332)

Scientists have obtained genetic confirmation of the assumption that a newfound rogue alga in California waters is the same strain that has been smothering seafloor communities in the Mediterranean. (p. 332)