Biological knowledge proceeds by a voyage inwards, first at the gross anatomy level later by microscopic explorations. Similarly, early limitations of human geographical horizons give way to inventions and explorations that take the adventurer, pilgrim, commercial exploiter, or conqueror to wider spheres and new concepts of the world's dimensions. He begins with primitive notions of time and the increasing need to develop means of measuring its passage-a natural enough entrÉe to astrology, astronomy, clocks, and calendars. Boorstin's choice of ""discoverers"" to title this omnibus history of the growth of scientific knowledge reflects his view of the importance of pivotal people, as well as the idea that knowledge is a revealing or an uncovering of ever broader vistas in time or space.
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