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  1. Astronomy

    Readers have questions about Ultima Thule, thirsty plants and vitamin D

    Readers had comments and questions about Ultima Thule, photosynthesis and more.

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  2. Health & Medicine

    FDA has approved the first ketamine-based antidepressant

    A nasal spray with a ketamine-based drug promises faster relief from depression for some people.

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  3. Anthropology

    Hominids may have hunted rabbits as far back as 400,000 years ago

    Stone Age groups in Europe put small game on the menu surprisingly early.

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  4. Oceans

    Tiny bits of iron may explain why some icebergs are green

    Scientists originally thought the green hue of some icebergs came from carbon particles.