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Four ways archaeologists have tried to gain insights into how flintknapping creates lithic variability are fracture mechanics, controlled experimentation, ****tion and attribute studies of lithic assemblages. Fracture mechanics has the advantage of drawing more directly on first principles derived from physics and material sciences, but its relevance to controlled experimentation, ****tion and lithic studies more generally has been limited. Controlled experiments have the advantage of being able to isolate and quantify the contri