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  1. Physics

    A star orbiting a black hole shows Einstein got gravity right — again

    For the first time, general relativity has been confirmed in the region near a supermassive black hole.

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  2. Genetics

    Here’s why wounds heal faster in the mouth than in other skin

    Wounds in the mouth heal speedily thanks to some master regulators of immune reactions.

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  3. Planetary Science

    Mars (probably) has a lake of liquid water

    A 15-year-old Mars orbiter has spotted signs of a salty lake beneath the Red Planet’s south polar ice sheets.

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  4. Health & Medicine

    Lowering blood pressure may help the brain

    Aggressively treating high blood pressure had a modest positive effect on the development of an early form of memory loss.