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Bigger bodies and wider beaks help birds like the bare-throated bellbird belt out calls louder than a jackhammer, but why such volume evolved remains unclear.

The human brain is built to hear voices. Speaking connects us to other people -- and ourselves. What do our voices reveal about ourselves?

One theory points to a long-awaited supersymmetric particle called a 'higgsino.' But that idea has some issues.

Finding the potential planet hints that our sun's death could lead to the creation of new worlds.

Microblazars -- a miniature version of blazars -- may be responsible for mysterious ultra-high-energy particles.

A waterborne pathogen flourishes while toads shelter underground. The finding may help conservationists rethink how to protect the threatened species.

Uneven supernova explosions may explain the unusual mix of elements in Milky Way stars once thought to be evidence of hypernovas.

Naegleria amoebas' exploration skills and crawling behaviors could help explain how the brain-eating variety travel into human brains.

A female humpback whale may have spent days with her stillborn calf. This rare sighting may suggest that baleen whales experience grief.

Scientists graded every river and stream in the contiguous United States, flagging specific repairs each one needs to support aquatic life.