In the Museum of Natural Sciences in Brussels, you will find the oldest known mathematical object: the Ishango bone. It is a notched bone, dated to around 22,000 years BC.
The bone was found in 1960 near Ishango, a place in (at that time) Belgian Congo. Research by a team of archaeologists, mathematicians, and engineers has now shown that it is a tally stick. They are likely arranged in bases 6 and 10, as is common in various African regions. It can be said with confidence that these two bones are the oldest testimonies of human ability to calculate or think logically.
Source: Wikipedia
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