The deceased, African historian Dr. Cheikh Diop has written that "The rediscovery of the true past of African (black) peoples should contribute to uniting them, each and all, binding them together from the north to the south of the continent, to enable them to carry on together a new historical mission for the greater good of humanity." With this principle and purpose in mind, different chapters of Blacks are devoted to the following topics: Paleo-anthropology and the origins of African & European people, including the Two Cradle Theory which presents a logical explanation of the cultural and instinctive differences between the two groups, blacks and whites. Concepts including matriarchy (vs. patriarchy), totemism, and ancestor worship which predates institutional religions are discussed. Black-African events of Ancient Egypt (Kemit), dates and people spanning 3,100 years before the Common Era (i.e., before Christ). These black African events include creation of the ancient world's original civilization, Ancient Egypt, and its intellectual contributions- creation of the 7 Liberal Arts and metaphysical thought- which it transmitted to Greco-Roman society and the entire world. Glorious, pre-colonial West African events, dates and people (e.g., Ghana, Mali, Songhai, Mossi, etc.) spanning 1,600 years."