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  1. 19553

    This article should also point out that only a very thick atmosphere could have allowed the surface temperature to be high while the radiation output from the sun was only 70 percent that at the present. J. Thomas BaylorAustin, Texas Theorists agree that the atmosphere of Mars was thicker when the planet was wetter. They’re […]

    By Science News
  2. Planetary Science

    Roving on the Red Planet

    Scientists review the discoveries made by the Mars rovers after nearly 18 months on the Red Planet.

    By Ron Cowen
  3. Math

    Divisibility by Seven

    An ingenious, recently developed method tests if a number is divisible by 7.

    By Ivars Peterson

  4. Cockroach Study

    For students and teachers, this Web page by high school biology teacher Mary Colvard offers a lesson plan for a lab in which students look for signs of learning in cockroaches.