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Jupiter’s moon Io is the Solar System’s most exotic satellite. Active volcanism on Io was discovered from observations by the Voyager 1 spacecraft in 1979, confirming a possibility suggested from theoretical studies of Io’s orbit. Our knowledge of Io’s volcanism, composition, and space environment were significantly increased as a result of observations by the Galileo spacecraft from 1996 through 2001. The end of the Galileo mission in 2003 ma...

During the past few decades we have witnessed an era of remarkable growth in the field of molecular biology. In 1950 very little was known of the chemical constitution of biological systems, the manner in which information was trans­ mitted from one organism to another, or the extent to which the chemical basis of life is unified. The picture today is dramatically different. We have an almost bewildering variety of information detailing many d...