Conditions have to be ripe for things to happen. For thousands of years man had no way to count past three. It was one, or many. We take it for granted, but the concept of number is actually rather complex. Even more complex is the concept of more and less. Once man learned that he three needles was in some way greater than four chickens, barter began.

That's my theory at least. Natural divisions exist. It takes man awhile to catch on.

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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman