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    Karen Weintraub

    Scientific American
    Woman running in the early morning.
    Why Do Some People Need Less Sleep Than Others?

    New genetic research in mice may reveal why some people need less sleep than others.

    • A human embryo at 5 weeks.
      Should the '14-Day Rule' for Growing Human Embryos Get Updated?

      Ethical guidelines on lab-grown human embryos beg for revamping, scientists say.

      By Karen Weintraub Published 21 March 17

    • group of baby mice.
      Healthy Baby Mice Produced from Mouse Mom's Skin Cells

      Skin cells from mouse moms were matured in a lab dish and developed into baby mice. The feat is a step toward a similar process that one day may work in humans.

      By Karen Weintraub Published 18 October 16

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