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  1. Anthropology

    Crocs take a bite out of claims of ancient stone-tool use

    Reptiles with big bites complicate claims of Stone Age butchery.

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  2. Astronomy

    A sandy core may have kept Enceladus’ ocean warm

    Friction in Enceladus’ porous core could help heat its ocean enough to keep it liquid for billions of years.

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  3. Neuroscience

    Alzheimer’s protein can travel from blood to build up in the brain

    Experiments in mice show Alzheimer’s protein can travel from the blood of an affected mouse to the brain of a healthy animal.

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  4. Ecosystems

    Invasive species are a growing global threat

    'The Aliens Among Us' describes how invasive species are colonizing — and disrupting — ecosystems worldwide.