Short-lived miniplanets inhabited the solar system in its earliest years

Meanwhile, researchers identify yet another strain of the livestock virus

A gene mutation that causes learning disabilities disrupts a neural stop signal

Clues to earlier tsunamis embedded in soil

Herbicide and fertilizer combine to help parasites attack frogs, suppress immune system

New satellite data suggest a much longer wet spell for the red planet

Molecule blamed for heart disease might be a bystander

"Allergy" cells in the rodent brain may keep baseline anxiety under control

New research suggests ocean-bound salmon have little trouble getting past dams.

Researchers defend olive fruit fly studies ridiculed by vice-presidential hopeful Sarah Palin

Competition between invasive herbivores could ease impact on beleaguered trees

Researchers engineer cancer-fighting purple tomatoes

Famous anti-impotence pill might compensate for muscle-weakening enzyme deficiency

Galaxies seem to have evolved according to a single, simple rule

Discovery of genetic mutation provides first link with birth defect

New precision satellite measurements will enable scientists to probe insides of distant stars

Combination of genetic engineering and drugs wipes out specific memories in mice

Holding a warm object makes people feel better about others

Newly identified mouse stem cells can grow into a mature prostate gland

Photosynthesis may have emerged later than previously thought

After shifting away from hunting and gathering, more pregnancies caused more tooth decay

Ancient Caribbean families appeared to share drug paraphernalia across generations

Gigantic black holes threw their weight around in the early universe

Fossil braincase adds details to transition from marine to terrestrial vertebrates