The paleolithic era, also known as the stone age, is a period in history that began approximate two and a half million years ago (the age of the oldest stone tools made by human beings that have so far been found) and 20,000 years ago, at which time the human race entered into the more advanced neolithic age, when agriculture began to be practiced, and the quality of stone tools improved. Eventually the neolithic era gave way to the bronze age, then the iron age, and so forth.

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