A whole series of giant leaps for mankind
Perhaps the most dramatic revolution in the way people live was wrought by technology. In 1923 private telephones were still largely playthings of the rich. Many rural areas had no electricity. The automobile was beginning to appear in large quantities. Radio's early enthusiasts tinkered with crystal sets in their living rooms just as today's home-computer buffs hunch over their machines.
If that era's technology seems crude now, science was then, at least in some areas, in a similar state. Learned astronomers argued vociferously over whether our...
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