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Scientists testing potential treatments for sleep apnea made an unexpected discovery. How quickly people react may depend on whether they're breathing in or out.

The 10th century treatment called Bald's eyesalve attacks microbes in multiple ways. Molecule mixtures from it may inspire modern medicine.

Gaps in early warning systems and community preparedness contributed to the high death toll from Nepal's debris flow.

Season 2 follows people losing their ability to speak -- and the AI and brain implants helping them find their voices again.

Ancient meteorites reveal a powerful magnetic field that may have helped feed the growing sun.

Avian flu, overfishing, and a super El Niño have decimated Peru's largest colony of Humboldt penguins. Scientists are holding out hope that their numbers will bounce back.

The rare fossil hints that differences in plumage may explain why some Cretaceous-era birds survived an asteroid impact but others died.

A record player-like microscope and computer simulations solve a longtime mystery, showing that metal ions bridge DNA strands that would normally repel.

Genetic testing of two tiny tiger cats from Bolivia revealed a new species, adding a new branch to the feline family tree.

Daily sea surface temperatures in the region where El Niño develops are more extreme than at any point in recorded history.