Einstein had a similar conversation with his friend in Prague, Philipp Frank. "A new fashion has arisen in physics," Einstein complained, which declares that certain things cannot be observed and therefore should not be ascribed reality. "But the fashion you speak of," Frank protested, "was invented by you in 1905!" Replied Einstein: "A good joke should not be repeated too often."61 The
( Walter Isaacson )
[ Einstein: His Life and ]
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