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  1. 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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  2. 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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  3. Ecosystems

    Invasive species are a growing global threat

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

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  4. Climate

    Humans are driving climate change, federal scientists say

    Human influence “extremely likely” to be dominant cause of warming in last 70 years, U.S.