Ever since, man has tried to make his life easier by the use of a greater number of tools. The first wheel (a round disc made out of an old tree) created as much stir in the communities of 100,000 B.C. as the flying machine did only a few years ago.
In Washington, the story is told of a director of the Patent Office who in the early thirties of the last century suggested that the Patent Office be abolished, because "everything that possibly could be invented had been invented." A similar feeling must have spread through the prehistoric world when the first sail was hoisted on a raft and the people were able to move from place to place without rowing or punting or pulling from the shore.