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  1. Animals

    Adult corals have been safely frozen and revived for the first time

    Chunks of living corals could be frozen for safekeeping and revived later to restore reef ecosystems that are withering in warming seas.

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  2. Earth

    How thunderstorms can spawn damaging ‘downbursts’

    Powerful winds called downbursts are not the same as a tornado, but the damage they cause can be similar — and can hit with little warning.

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  3. Readers ask about cat contraception, big G and more

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  4. Sewers provide solutions to public health data gaps

    Editor in chief Nancy Shute discusses how scientists are looking to wastewater to track COVID-19 and other diseases.