Archeologists, the people who study the things they find in the earth that they use to tell us about those ancestors of ours, have a method of deciding how old things that they found in the dirt.
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The techniques are like those used by geologists to determine the age of rocks buried millions of years ago.
Tools, one of the very important relics of human beings, have improved over the years.
The first human made tools found by archeologists were made from bone, stone and, rarely wood.
As human technology progressed, stone progressed to copper, bronze, iron and the rest.
