TLS, one page, 8.5 x 11, Linus Pauling Institute of Science and Medicine letterhead, May 11, 1988. Letter to Mark Hutchinson, in part: "In answer to your question, asking what the greatest scientific discovery of the 20th century was, I would answer by giving two discoveries. One is the discovery of quantum theory and quantum mechanics by Planck, 1900, and Heisenberg, Schrodinger, and Dirac, around 1926. The other is the discovery of relativity by Einstein, 1905 and 1917. These discoveries have led to a great change in our understanding of the nature of the universe." In fine condition.
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