... clock we do not readily see that even the minute hand is moving, and if the clock struck only once in a hundred years we can conceive of people arguing whether the hands did really move at all. So it often is with the changes that go on from generation to generation in living creatures. The flux is so slow, like the flowing of a glacier, ... — The Outline of Science, Vol. 1 (of 4) - A Plain Story Simply Told • J. Arthur Thomson
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