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  1. Health & Medicine

    50 years ago, scientists thought coffee might treat hyperactivity

    Decades of follow-up research into whether caffeine can treat the symptoms of kids with ADHD has come up with more questions than answers.

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  2. Readers discuss meteorite identification, fly factories and more

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  3. Paleontology

    This ancient, Lovecraftian apex predator chased and pierced soft prey

    Half a billion years ago, Anomalocaris canadensis probably used its bizarre headgear to reach out and snag soft prey with its spiky clutches.

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  4. From our brains to gravity, how science surprises us

    Editor in chief Nancy Shute discusses how science unravels mysteries, such as missing chunks of brain, gravity's strength and the start of the Viking era.