The first data from a new Canadian detector of particles called neutrinos not only resolve a 30-year-old puzzle about how the sun works, but also revise estimates of mysterious "dark" matter in the universe and strengthen a key challenge to the prevailing theory of particle physics. (p. 388)

Researchers discover why the anticancer drug Gleevec, also called STI-571, helps many patients who have chronic myelogenous leukemia but not those who have entered the crisis stage of the disease. (p. 389)

A sleek predator and a pot-bellied giant dinosaur have emerged from North American rocks to fill in a 30-million-year gap in the dinosaur fossil record. (p. 389)

Although unable to say a word, 4-month-olds coordinate the timing of their vocalizations with those of adult partners in conversational ways that may have implications for social and intellectual development. (p. 390)

Researchers have developed a new technique for attaching groups of atoms to the sides of carbon nanotubes, creating compounds with extraordinary strength and conductivity. (p. 390)

Lutein, a yellow pigment in many fruits and vegetables, may inhibit processes that jump-start the development of atherosclerosis. (p. 391)

Drosophila have a rotating ear—and odor-sensing—structure that's new to science. (p. 391)

Diets rich in fish may cut a man's risk of prostate cancer. (p. 392)

Airline flight attendants with chronic jet lag have higher stress hormone concentrations and smaller temporal lobes (centers of short-term memory in the brain)than do more rested attendants. (p. 392)

Chemists have devised a new way to stabilize highly reactive molecules called carbenes. (p. 392)

Researchers have performed the first ever chemical studies on the element hassium. (p. 392)

Astronomers are beginning to use the cosmic microwave background, the remnant glow from the Big Bang, in a dramatically different way: Instead of treating it as a snapshot of the early universe, researchers are proposing to employ the radiation as a flashlight that probes the evolution of structure in the universe over its entire 13-billion-year history. (p. 394)

Trace fossils found in a vacant lot in a small town in Utah, including the footprints of meat-eating dinosaurs, could soon be protected as part of a new U.S. national monument. (p. 397)

Excavations near an Egyptian oasis have unearthed the fossils of an animal that probably ranks as the second-most-massive dinosaur known. (p. 397)

By spraying surfaces with a light-emitting polymer, researchers have taken a step toward making new sensors for traces of common explosives. (p. 397)

The novel dinosaur robot Troodon takes two-legged walking machines onto new terrain. (p. 397)

A compact, new instrument exploits quantum mechanics to rapidly identify illegal drugs, pollutants, and other chemicals, on the spot. (p. 397)

Researchers are designing novel porous materials that could clean up toxins, store gases, or catalyze difficult chemical reactions. (p. 398)