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  1. Readers ask about positronium, wild bees and more

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  2. In praise of serendipity — and scientific obsession

    Editor in chief Nancy Shute writes about the role of serendipity and scientific obsession played in this month's feature stories.

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  3. Tech

    A smartwatch app alerts users with hearing loss to nearby sounds

    With a new smartwatch app, users who are deaf or hard of hearing can get alerts that an alarm is going off or someone is knocking at the door.

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  4. Animals

    A blue-green glow adds to platypuses’ long list of bizarre features

    The discovery of platypuses’ fluorescent fur has researchers wondering if the trait is more widespread among mammals than anyone has realized.