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These assumptions have been challenged by the discovery in 2009 of two small pieces of bone airing striations made by stone. One bone was from an antelope sized animal and the other from a bovid the size of a modern cow. The bones were found at Dikika, Ethiopia within the securely dated Sidi Hakoma formation and given an age of million years. By process of elimination, trampling of the bones underfoot by animals, toothmarks or their having been tumbled in a stream were ruled out and the only explanation for the markings appears to be the use of stone to scrape flesh from the bones and striking one of the bones to fracture it and extract the marrow.
In book III, Locke discusses abstract general ideas. Everything that exists in the world is a particular “thing.” General ideas occur when we group similar particular ideas and take away, or abstract, the differences until we are left only with the similarities. We then use these similarities to create a general term, such as “tree,” which is also a general idea. We form abstract general ideas for three reasons: it would be too hard to remember a different word for every particular thing that exists, having a different word for everything that exists would obstruct communication, and the goal of science is to generalize and categorize everything.