Sub-Saharan Africa

Tally marks

Human invent tally marks, their first numeral systems

Around 43,000 years ago, early humans carved the first tally marks into bone, inventing the earliest known numeral systems. This brilliant shift toward abstract mathematics allowed our ancestors to track lunar cycles and inventory resources. It laid the vital groundwork for modern mathematics, commerce, and advanced human societal planning.

Humans invent the harpoon, perhaps in modern day Democratic Republic of Congo

This simple, yet revolutionary, tool required a unique combination of ingenuity: the abstract understanding of biomechanics, the planning depth to anticipate seasonal resources, and the skilled craftsmanship of complex composite tools. The earliest examples of this innovation, the Semliki harpoons, were unearthed at an archaeological site near the Semliki River in the Democratic Republic of the Congo.