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  1. Excuse me, dear, which octopus are you?

    Male blue-ringed octopuses get pretty far along in their courtship before they determine whether their partner is a female.

    By Susan Milius

  2. How butterflies can eat cyanide

    Some newly recognized chemical wizardry lets some Heliconius caterpillars thrive on leaves that defend themselves with cyanide.

    By Susan Milius
  3. Astronomy

    Astronomers get radio protection

    Astronomers studying the universe at millimeter-wave energies-the high-frequency portion of the radio spectrum-were given an official guarantee last month that commercial satellites and other communication devices won't interfere with the scientists' observations.

    By Ron Cowen
  4. Astronomy

    The smashup that rejuvenates

    For some elderly stars, the fountain of youth may be only a collision away.