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  1. Particle Physics

    A new quasiparticle lurks in semiconductors

    Strange entities called collexons hint at undiscovered physics among interacting subatomic particles in a semiconductor.

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  2. 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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  3. 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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  4. 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.