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  1. Health & Medicine

    In 2019, a ketamine-based antidepressant raised hopes and concerns

    Ketamine and related molecules might ease severe depression, but the drugs come with baggage.

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  2. Animals

    A year of big numbers startled the world into talking about nature

    One million species are at risk. Three billion birds have been lost. Plus surges in Amazon burning.

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  3. Health & Medicine

    Vaping’s dangers loom large amid more than 50 U.S. deaths this year

    Lung injuries and deaths linked to vaping in 2019 are a sobering indication of the dangers of e-cigarettes as teen use continues to rise.

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  4. Space

    2019 brought us the first image of a black hole.