This Week's Letters

Science  28 Feb 1997:
Vol. 275, Issue 5304, pp. 1245-1249
DOI: 10.1126/science.275.5304.1245

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Carl Sagan is remembered as one who could “skillfully communicate the power and beauty” of scientists' work to the public. The costs of colliders and “marine protected areas” are discussed. Vigilance in safeguarding the integrity of clinical trials is stressed. And three writers emphasize “the experimental nature of Biosphere 2” (right, Biospherian at work).