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'IRREPRESSIBLE': Carl Sagan died last month. The late Carl E. Sagan was remembered by friends, former students, and colleagues for his research and his passionate efforts to spark public interest in science at a tribute following his funeral December 23 in Ithaca, N.Y. The Cornell University astronomer, who had battled a bone-marrow disease for two years, died December 20 of pneumonia at age 62 in Seattle, leaving the science community in laudatory mourning. Joshua Lederberg, the Raymond and Be

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'IRREPRESSIBLE': Carl Sagan died last month. The late Carl E. Sagan was remembered by friends, former students, and colleagues for his research and his passionate efforts to spark public interest in science at a tribute following his funeral December 23 in Ithaca, N.Y. The Cornell University astronomer, who had battled a bone-marrow disease for two years, died December 20 of pneumonia at age 62 in Seattle, leaving the science community in laudatory mourning. Joshua Lederberg, the Raymond and Beverly Sackler Foundation Scholar at Rockefeller University in New York, recruited Sagan to the National Aeronautics and Space Administration in 1958 as part of an advisory committee on interplanetary quarantine policies. Lederberg recalls: "What was most impressive about Carl, besides his mental agility and his inexhaustible fund of factual detail and plausible inference about planetary evolution, was his positive humor and his irrepressible enthusiasm. His curiosity was boundless." Sagan cofounded the Planetary ...

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