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Astronomy

Dark matter isn’t interacting with itself after all

Hints that a distant galactic collision knocked dark matter askew fizzled with new observations.

Environment

Microplastics may enter freshwater and soil via compost

Compost is pinpointed as a source of plastic pollution, but environmental fate and effects unknown.

Neuroscience

Human brains make new nerve cells — and lots of them — well into old age

In humans, new neurons are still born in old brains, new research suggests.

Paleontology

This ancient lizard may have watched the world through four eyes

A lizard that lived 50 million years ago had both a third and a fourth eye.