"Figuring out when humans began to count systematically, with purpose, is not easy. Our first real clues are a handful of curious, carved bones dating from the final few millennia of the three-βmillion-βyear expanse of the Old Stone Age, or Paleolithic era. Those bones are humanityβs first pocket calculators: For the prehistoric humans who carved them, they were mathematical notebooks and counting aids rolled into one" 
Laphamβs Quarterly
The Early History of Counting | Keith Houston
How ancient peoples learned to keep a tally.



