What is the Lebombo bone?

The Lebombo bone is the oldest known mathematical artifact on earth, a small piece of baboon leg bone, about 8 centimeters long, with 29 deliberate notches carved into it, found in a cave in southern Africa and dated to somewhere between 42,000 and 44,000 years ago.

This fits perfectly where we are in the conversation. We've been tracing African civilization through queens, kingdoms, slave forts and revolutions. The Lebombo bone takes us all the way back to the beginning, before any of that, to the very first time a human being counted something and made a mark to remember it.

What it is and where it was found

The Lebombo bone is a bone tool made of a baboon fibula with incised markings, discovered in Border Cave in the Lebombo Mountains, located between South Africa and Eswatini (formerly Swaziland). The bone is approximately 8 centimeters long, and is between 42,000 and 43,000 years old according to 24 radiocarbon datings. Radiocarbon dating is a method scientists use to measure the decay of a radioactive form of carbon in organic material, which gives a reliable estimate of how old something is.

It was discovered in the 1970s in Border Cave, a rock shelter on the western scarp of the Lebombo Mountains. The discovery was led by archaeologist Peter Beaumont.

What those 29 notches mean

The bone features 29 distinct notches carved into its side. These notches are deliberate, not accidental scratches from butchery.

Twenty-nine is a number that keeps catching researchers' attention. A lunar month, the time it takes the moon to complete one full cycle, is roughly 29.5 days. Experts have hypothesized that the bone might have been used as a lunar phase counter, and The Universal Book of Mathematics suggests the notches could have served as a means of tracking lunar cycles, hinting at a connection to monitoring menstrual cycles.

This would imply that African women may have been the first mathematicians, as the intricate task of keeping track of lunar phases is integral to understanding and predicting menstrual patterns.

That interpretation is debated: the bone is clearly broken at one end, so the 29 notches may or may not represent the complete original count. And there is currently no diagnostic technique that can reliably determine the social purpose or use of prehistoric linear marks inscribed on surfaces. What is not debated is that the marks are intentional and mathematical in nature.

Who made it

The people who created the Lebombo bone were likely part of the San people, also known as the Bushmen or Basarwa, indigenous hunter-gatherer groups with a rich cultural history. The bone resembles a calendar used by the early inhabitants of the area, and this way of making tallies is still used by the San people today.

Why it matters

The implications of the Lebombo bone's purpose are profound, as they challenge traditional narratives about the origins of mathematics and the roles of different cultures in its development.

The standard story most of us were taught places the origins of mathematics in ancient Greece or Mesopotamia. The Lebombo bone predates those civilizations by tens of thousands of years, and it comes from sub-Saharan Africa. Every spreadsheet, financial model, engineering calculation, navigation system and algorithm traces its ancestry back to the impulse to count and record, and the oldest evidence of that impulse is African.

The Lebombo and Ishango bones are ancient artifacts that represent the earliest known evidence of mathematical counting and data storage, and these Paleolithic tools suggest that the first use of accounting emerged in Africa tens of thousands of years ago. The Ishango bone, found in what is now the Democratic Republic of Congo, is younger, at around 20,000 years old, but its notching system is even more complex, showing what some researchers describe as early arithmetic groupings.

The thread we've been following from the pharaohs of Egypt to the gold routes of Mali to the queens of Kush and Ndongo all rests on a foundation of African intellectual achievement. The Lebombo bone is the oldest piece of that foundation we have yet found.

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The book

This follows on from
What did Africa give the world?

Africa gave the world everything that came first: the human species itself, the oldest mathematical artifacts, the 365-day calendar, the foundations of geometry and medicine, the alphabet and writing, iron metallurgy, and the moral framework that later became the ethics of every major civilization.

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