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Answers to the following questions are all to be found in the pages of Nature this year. A prize of a year's subscription to Nature is offered for the first correct set of answers opened by the Editor after January 31, or for the best entry.
We asked for identification of the people depicted on the front cover of Nature, August 17, 1973. The prize-winning solution given here came from D. P. L. Green, Department of Biophysics, University College, London.
