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  1. Faulty Fountains of Youth

    As a source of new cells to revitalize tissues, adult stem cells may cause some of decline of the body in old age, but the link between the two is not as simple as it seems.

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  2. Humans

    Letters from the February 9, 2008, issue of Science News

    Small, or just invisible? “Heavy Find: Weighty neutron stars may rule out exotic core” (SN: 1/12/08, p. 20) says that the companion star of the pulsar PSR B1516+02B must be “tiny” because it cannot be seen. Isn’t it possible that the companion is made of dark matter? Is there a “wobble” test or other way […]

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  3. Humans

    Web Special: Diabetes drug and conflicts of interest

    A U.S.