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  1. Chemistry

    Alien Pizza, Anyone?

    Although many biochemical molecules come in left-handed and right-handed versions, life on Earth uses one version exclusively, and some controversial experiments suggest this preference might not be due to chance.

    By Davide Castelvecchi
  2. Planetary Science

    Idiosyncratic Iapetus

    The strange appearance of Saturn's moon Iapetus suggests that it was frozen in shape soon after birth, providing a glimpse into conditions in the early solar system.

    By Ron Cowen
  3. Humans

    Letters from the August 18, 2007, issue of Science News

    Exhaustive analysis I would debate the “1,000 watts or more” value attributed to typical adults during strenuous exercise (“Powering the Revolution: Tiny gadgets pick up energy for free,” SN: 6/2/07, p.