"The oldest fossils of modern man are nearly 150,000 years old. Probably on a rainy day, a human walked in wet sand near what is now known as Border Cave in the Lebombo Mountains between South Africa and Swaziland. In the 1970's during the excavations of Border Cave, a small piece of the fibula of a baboon, the Lebombo bone, was found marked with 29 clearly defined notches, and, at 37,000 years old, it ranks with the oldest mathematical objects known. The bone is dated approximately 35,000 BC and resembles the calendar sticks still in use by Bushmen clans in Nimibia."