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Science 31 March 2000:
Vol. 287. no. 5462, p. 2421
DOI: 10.1126/science.287.5462.2421a
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Letters

This Week's Letters

The survival strategies of cyanobacteria may hint at how some forms of life could have survived global ice ages as proposed by the "snowball Earth" hypothesis. A meeting held in commemoration of the 1975 Asilomar conference on recombinant DNA prompts discussion about the ownership of genes: "The ethics and risks of genetic technologies...surround the questions of who owns these [genes and technologies] and to what ends are they directed--profit or the public good?" Advice is offered on how to improve the scientific expertise of the State Department. A chemist reminisces about a hot field of study in the 1950s--reactions that occur at negative pH values. And how details in portraits by artist Chuck Close trigger the perception of shadow and depth is discussed.

Letters in This Issue

space space
[Letter] Life on Snowball Earth
Warwick F. Vincent and Clive Howard-Williams
[Letter] Asilomar Revisited
John Coulter. Editor's note
[Letter] Untapped Source of Diplomats
Peter Cohen
[Letter] Respect for the Opposition
Christopher D. Heinen; Steven B. Sands
[Letter] pH Values Below Zero
William A. Pryor
[Letter] Close Encounters: Details Veto Depth from Shadows
Patrick Cavanagh and John M. Kennedy. Response Denis G. Pelli and Melanie Palomares
[Letter] Corrections and Clarifications


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Science. ISSN 0036-8075 (print), 1095-9203 (online)