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Evolving the ability to run may also have made our ancestors smarter, suggesting that exercise can be healthy for the brain as well as the body.

A round-up of recent discoveries in behavior research

Genomic analyses reveal that the polar bear evolved between 4 and 5 million years ago, far earlier than previous studies had estimated.

Much of what researchers believe about the public and effective communication is wrong.

Researchers create a swimming jellyfish mimic by reverse-engineering the creature's pumping action, paving the way for new methods of engineering replacement organs.

The University of Colorado graduate student who allegedly killed 12 and injured dozens more in a crowded movie theater last night seemed “normal” just a few months earlier, a fellow researcher recalls.

Biologist David Gruber studies radiant creatures and their fluorescent proteins.

A relatively new pair of sex chromosomes in the fruit fly allows researchers to track their evolution from the beginning.

A bacterial protein refolds itself into two dramatically different shapes with distinct roles.

Spawning algal blooms by fertilizing the Southern Ocean with iron could help sink atmospheric carbon to the deep ocean—and maybe slow the course of climate change.

Depression in post-op breast cancer patients can cause tumors to establish in bone.

Random chance, plus small differences in uterine environments, give rise to divergent epigenetic patterns in identical twins.