In the eighteenth century it was often convenient to regard man as a clockwork automaton. In the nineteenth century, with Newtonian physics pretty well assimilated and a lot of work in thermodynamics going on, man was looked on as a heat engine, about 40 per cent efficient. Now in the Twentieth Century, with nuclear and subatomic physics a going thing, man Something Which Had Become absorbs X-rays, gamma rays and neutrons.
(See Chapter 10)
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