Crick was in such demand as a lecturer and participant at conferences that on several occasions during the 1960s and early 1970s, he cited exhaustion as a medical reason for declining speaking engagements. In this case, Crick prematurely left a colloquium on "Cell Interactions," held at the Royal Society of Medicine in London, November 15-17, 1971, even though he was scheduled to chair a later session.
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