Strengthening a challenge to the prevailing theory of particle physics, measurements of elusive particles called antineutrinos from nuclear reactors suggest that no neutrino types, be they matter or antimatter, have stable identities. (p. 371)

In its first large-scale test on newly diagnosed leukemia patients, the drug imatinib—also called Gleevec and STI-571—stopped or reversed the disease in nearly all patients receiving it. (p. 371)

Researchers suggest that intermittent impacts by huge asteroids and comets some 3.5 billion years ago profoundly influenced the landscape of Mars. (p. 372)

The commotion of everyday business in indoor spaces contaminated with anthrax can launch the bacterium's dangerous spores into the air. (p. 372)

A blue jay will cooperate with a buddy for mutual gain in food despite opportunities to betray the partnership. (p. 373)

A new oral drug created to ease a genetic disorder could have contraceptive benefits. (p. 373)

A brain-imaging study indicates that the primary motor cortex, the control center for issuing motor commands, also aids in the perception of the body's position and planning for upcoming movements. (p. 374)

Astronomers have found new evidence supporting the view that the Milky Way and many other spiral galaxies suffered their last major collision billions of years ago. (p. 376)

Medical researchers are increasingly turning to computer simulations to help them understand the complexity of living systems, design better drugs, and treat patients more effectively. (p. 378)

A new model of icicle growth may explain the strange fact that ripples often found on those icy spikes typically sit about 1 centimeter apart, whether the icicles themselves are big or small. (p. 381)

Astronomers have for the first time measured with high precision the size of a small star, Proxima Centauri, the known star nearest to the solar system. (p. 381)

Bilirubin, which causes jaundice in newborns, may protect against cellular damage. (p. 381)

By unleashing radio waves inside bone, researchers have stopped intractable pain in people with cancer that has spread to their skeletons. (p. 382)

A new brain-imaging technique can supply proof of Parkinson's disease in people whose symptoms fall short of the standard definition of the disease. (p. 382)

Using a scanning technology called microcomputerized tomography, scientists have a new way to look at the difference between bone exposed to estrogen and bone deprived of it. (p. 382)

A tiny disposable flash camera that a person swallows can detect problems in the small intestine. (p. 382)