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Some of Hardy's examples seem unfortunate in retrospect. For example, he writes, "No one has yet discovered any warlike purpose to be served by the theory of numbers or relativity, and it seems unlikely that anyone will do so for many years." Since then number theory was used to crack German Enigma codes and much later, figure prominently in public-key cryptography and the inter-convertability of mass and energy predicted by special relativity forms the physical basis for nuclear weapons.