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  1. Anthropology

    Fossil marks suggest hominids butchered one another around 1.45 million years ago

    Researchers disagree whether new evidence of stone tool marks on a hominid leg bone reflects ancient cannibalism or perhaps some other, undetected behavior.

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  2. Readers ask about Saturn’s icy rings, transparent fish and more

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  3. Astronomy

    50 years ago, a search for proof that the Maya tracked comets came up short

    The mystery of whether the ancient civilization tracked comets endures, but recent evidence hints the Maya tracked related meteor showers.

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  4. Boys and girls are suffering, but in different ways

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  5. Life

    1.6-billion-year-old