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Health & Medicine

Readers contemplate aging research

Aging research, dino guts and Earth's quasisatellite in reader feedback.

Oceans

Fish escapes from marine farms raise concerns about wildlife

Farmed salmon, sea bass and other fish frequently escape from sea cages into the ocean. Will these runaways harm native wildlife?

Paleontology

Preteen tetrapods identified by bone scans

Roughly 360 million years ago, young tetrapods may have schooled together during prolonged years as juveniles in the water.

Microbes

Microbial matter comes out of the dark

Undiscovered bacteria challenge what scientists know about microbial life.