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  1. Health & Medicine

    A new ketamine-based antidepressant raises hope — and questions

    Little is known about the long-term effects on people of a newly approved antidepressant based on the anesthetic ketamine.

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  2. Planetary Science

    Ryugu is probably a chip off one of these two other asteroids

    Japan’s Hayabusa2 team has narrowed down the asteroid Ryugu’s origins based on its color.

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  3. Astronomy

    X-ray ‘chimneys’ connect the Milky Way to mysterious gamma-ray bubbles

    Two columns of X-rays that are hundreds of light-years long could explain the existence of giant bubbles of energetic light that sandwich the galaxy.

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  4. Paleontology

    In a first, a fossilized egg is found preserved inside an ancient bird

    Scientists have found the first known fossil of a bird that died with an unlaid egg inside its body.