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  1. Life

    Megalodon, the largest shark ever, may have been a long, slender giant

    The ancient shark is typically imagined with the scaled-up stout frame of a modern great white. But in life, the giant may have been more elongated.

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  2. What a parrot knows, and what a chatbot doesn’t

    Editor in chief Nancy Shute discusses AI chatbots' vulnerabilities and the intelligence of parrots.

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  3. Readers discuss marathoners’ myelin, menopausal chimps and more

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  4. Physics

    50 years ago, timekeepers deployed the newly invented leap second

    After more than 50 years, metrologists will stop using the leap second to align the time kept by atomic clocks with the rate of Earth’s spin.