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  1. Life

    Prions clog cell traffic in brains with neurodegenerative diseases

    Prions may derail cargo moving inside brain cells, perhaps contributing to cell death in prion diseases.

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  2. Earth

    Flooding Earth’s atmosphere with oxygen may not have needed a triggering event

    Building an oxygen-rich world doesn’t require volcanism, supercontinent breakups or the rise of land plants — just nutrient cycling, a study finds.

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  3. Quantum Physics

    Quantum jitter lets heat travel across a vacuum

    In a first, scientists observed tiny, vibrating membranes exchanging heat due to quantum fluctuations.

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  4. Archaeology

    A nearly 44,000-year-old hunting scene is the oldest known storytelling art

    Cave art in Indonesia dating to at least 43,900 years ago is the earliest known storytelling art, and shows otherworldly human-animal hunters.