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Many white supremacist organizations reared their ugly heads in the years after the Civil War.
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Dating stone age tools

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Blade flakes were "pre-forms" that could be fashioned into knives, hide scrapers, spear tips, drills, and other tools.

There are scholars who believe that this approach is too technologically oriented."We were really excited by the antiquity of the residue," said April Nowell, an anthropology professor at the University of Victoria and lead author of the research published online today in the Journal of Archaeological Science.She said the variety of animals butchered there suggests the people using the site had a lot of knowledge about the resources available in the area at different times of year and were socially sophisticated.Starting in the grasslands of the rift, Homo erectus, the predecessor of modern humans, found an ecological niche as a tool-maker and developed a dependence on it, becoming a "tool equipped savanna dweller." Archaeological discoveries in Kenya in 2015, identifying possibly the oldest known evidence of hominin use of tools to date, have indicated that Kenyanthropus platyops ( a 3.2 to 3.5-million-year-old Pliocene hominin fossil discovered in Lake Turkana, Kenya in 1999 ) may have been the earliest tool-users known.Prior to the discovery of these "Lomekwian" tools, the oldest known stone tools had been found at several sites at Gona, Ethiopia, on the sediments of the paleo-Awash River, which serve to date them.The rift served as a conduit for movement into southern Africa and also north down the Nile into North Africa and through the continuation of the rift in the Levant to the vast grasslands of Asia.