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  1. Earth

    New contender for Earth’s oldest rocks

    Observing rare isotopes in rocks along the Hudson Bay in Northern Quebec suggest the rocks have remained intact for 4.28 billion years, making them Earth's oldest.

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  2. Health & Medicine

    Window of opportunity for stroke treatment widens

    Use of clot-busting drugs as long as 4½ hours after an event pays dividends later.

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  3. Physics

    Photons caught in the act

    Physicists manipulated a microwave pulse and could essentially watch it transition from a quantum state into the realm of classical physics.

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  4. Health & Medicine

    Closing in on Rett syndrome

    Scientists find that a particular part of the mouse brain is responsible for behavioral abnormalities associated with Rett syndrome, an autism spectrum disease that strikes females.