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  1. Lease on Life: Old mice live longer when given young ovaries

    Implanting young ovaries in old mice extends their life expectancy.

    By Sorcha McDonagh
  2. Materials Science

    Super Fibers: Nanotubes make tough threads

    New fibers made from carbon nanotubes and a polymer appear tougher than any other known synthetic or natural material.

    By Jessica Gorman
  3. Health & Medicine

    Full-Length Pregnancy: Progesterone product may reduce premature births

    A drug related to the female hormone progesterone helps some pregnant women who are prone to premature birth extend their pregnancies.

    By Nathan Seppa

  4. 19253

    I have always been fascinated by the subject of this article. I have a simple question: Is there a definitive set of standards (physical or behavioral or both) that defines modern Homo sapiens? Lew RobertsFranklin Square, N.Y.