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  1. Protein may help the eyes tell time

    A human version of melanopsin, originally found in the skin, eyes, and brains of frogs, has been discovered in the inner retina and may be the long-sought photoreceptor for the human biological clock.

    By John Travis
  2. Astronomy

    A chance to point Hubble

    Get out your heavenly wish list: Astronomers working with the Hubble Space Telescope are soliciting suggestions for where to point the orbiting observatory this summer.

    By Ron Cowen
  3. Astronomy

    A possible signal from Polar Lander

    Astronomers may have heard a faint signal from the vanished Mars Polar Lander spacecraft last month but, as of mid-February, have not detected another.

    By Ron Cowen

  4. 19105

    As a trainer of tracking dogs, I was interested in your article about attempts to duplicate electronically the scenting ability of dogs.