Originally given as an address to the Pacific Division of the American Association for the Advancement of Science, is copyrighted by the AAAS, and is reprinted with their permission from Science, 13 December 1968, vol. 162, pp. 1243-48.
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Originally given as an address to the Pacific Division of the American Association for the Advancement of Science, is copyrighted by the AAAS, and is reprinted with their permission from Science, 13 December 1968, vol. 162, pp. 1243-48.