Special Section: Onward and Upward

A week after he appeared on TIME's list of 200, M.I.T. Microbiologist David Baltimore was back in the news. In an act of bold leadership, he called on fellow scientists to examine the potential "biohazards" of genetic research. He was one of the prominent signers of a published letter in which DNA researchers pledged to halt certain types of experiments that might create novel and dangerous microorganisms or cancer-causing viruses. The scientists asked others around the world to join them in "voluntarily deferring" the dangerous work on recombinant DNA.

The letter caused an...

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