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  1. Health & Medicine

    A tooth-enamel protein is found in eyes with a common form of macular degeneration

    Researchers linked a tooth-enamel protein with calcium deposits in eyes suffering ‘dry’ AMD, which could lead to treatments for the vision disorder.

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  2. Space

    Astronomers have found the edge of the Milky Way at last

    Computer simulations and observations of nearby galaxies let astrophysicists put a firm number on the Milky Way's size.

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  3. Readers weigh in on coronavirus, cats and more

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  4. When coronavirus is both work and worry

    Our editor in chief Nancy Shute discusses what it's like to cover the current coronavirus pandemic.