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  1. Health & Medicine

    Readers intrigued by ancient animals’ bones

    Readers had questions about gut bacteria, woolly rhino ribs and ancient horses hooves.

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  2. Life

    Defining ‘species’ is a fuzzy art

    Here's why scientists still don't agree on what a species is.

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  3. Animals

    This sea slug makes its prey do half the food catching

    Nudibranchs’ stolen meals blur classic predator-prey levels.

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  4. Astronomy

    Hot, rocky exoplanets are the scorched cores of former gas giants

    Hot, rocky exoplanets are probably the scorched cores of former gas giants, so astronomers shouldn’t trust them for information about true Earth twins.