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hus we got to know not merely the man and the friend, but also the professional. [9]The intensity and depth of his concentration were fantastic. When battling a 16recalcitrant problem, he 17worried it as an animal worries its prey. Often, when we found ourselves up against a 18seemingly insuperable difficulty, he would stand up, put his pipe on the table, and say in his 19quaint English, “I will a little tink” (he could not pronounce “th”). Then he would pace up and down, 20twirling a lock of his long, graying hair around his forefinger. [10]A dreamy, faraway and yet inward look would e over his face. There was no appearance of concentration, no furrowing of the browonly a 21placid inner munion. The minutes would pass, and then suddenly Einstein would stop pacing as his face relaxed into a gentle smile . He had found the solution to the problem. Sometimes it was so simple that Infeld and I could have 22kicked ourselves for not having thought of it. But the magic had been performed invisibly in the depths of Einstein39。s methods. His 1905 theory of relativity, for example, was built on just two simple assumptions. One is the socalled principle of relativity, which means, roughly speaking, that we cannot tell whether we are at rest or moving smoothly. The other assumption is that the speed of light is the same no matter what the speed of the object that produces it. You can see how reasonable this is if you think of agitating a stick in a lake to create waves. Whether you wiggle the stick from a stationary 27pier , or from a rushing speedboat, the waves, once generated, are on their own, and their speed has nothing to do with that of the stick. [14]Each of these assumptions, by itself, was so 28plausible as to seem primitively obvious. But together they were in such violent conflict that a 29lesser man would have dropped one or the other and fled in panic. Einstein daringly kept bothrevolutionized physics. For he demonstrated they could, after all, exist peacefully side by side, provided we gave up cherished beliefs about the nature of time. [15]Science is like 30a house of cards, with concepts like time and space at the lowest level. 31Tampering with time brought most of the house tumbling down, and it was this that made Einstein39。s achievement. Words failed him, and with a shrug of helplessness he pointed to his wristwatch, and said in tones of 32awed amazement, “It all came from this.” His very ineloquence made this the most eloquent tribute I have ever heard to Einstein39。s work, performed quietly with pencil and paper, seemed remote from the 33turmoil of everyday life: But his ideas were so revolutionary they caused violent controversy and irrational anger. Indeed, in order to be able to award him a belated Nobel Prize, the selection mittee had to avoid mentioning relativity, and pretend the prize was awarded primarily for his work on the quantum theory. [17]Political events upset the 34serenity of his life even more. When the Nazis came to power in Germany, his theories were officially declared false because they had been formulated by a Jew. His propert