In 2004, when social networking sites were still pure at heart, there was the website Africanfrontdotcom  - and one of the pages listed African history dating back to 40,000,000 BCE. My calling is to gather information, and I immediately copied this timeline from the website because of my preference. Now, of course, due to the colonization of many African nations, other cultures appropriated much of African history. So I use  this info is a reference point for fact-checking and inclusion. This m