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  1. Tech

    Liberty’s smooth move

    Sensors clamped to the Liberty Bell's crack show that it could handle the stress of a move.

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  2. Putting Out the Welcome Mat: Chemical guides germ cells to gonads

    A chemical made in the gonads attracts the embryonic cells that will one day form eggs or sperm.

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  3. Health & Medicine

    Deadly Stowaways: Seeds of cancer in transplant recipients are traced back to donors

    Precancerous cells that grow into Kaposi's sarcoma are sometimes introduced into a person in an organ transplant.

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  4. Anthropology

    Cannibalism’s DNA Trail: Gene may signal ancient prion-disease outbreaks

    Cannibalism among prehistoric humans may have left lasting genetic marks.