En route Kessler asked if relativity applied to … atom) comes into it here. So size, measurement, … Einstein confirmed that size is the ultimate factor, … Every atom of iron has precisely the same … Nature knows only atoms, whether of iron or … [Count Harry Kessler, The Diaries of a Cosmopolitan--1918-1937, London: Weidenfeld & Nicolson, 1971, p. 137-8]
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