The Ishango bone is the oldest known object containing logical carvings. It was discovered in the Congo, and has been dated to be 22000 years old.
From Harvard's Math Department Oliver Knill's Teaching Math with a Historical Perspective
Natural Numbers. Counting can be realized by sticks, bones, knots on a string or pebbles. The tally stick concept is still used today...An other famous paleolithic tally stick is the Ishango bone, the fibula of a baboon. It could be 20,000-30,000 years old.
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