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And this only included what was visible on the surface. This shows the rocky landscape of southern Libya and the artifacts that are found in high abundance.Figure C of the supplemental material from the paper by Foley RA, Lahr MM (2015) Lithic Landscapes: Early Human Impact from Stone Tool Production on the Central Saharan Environment. The researchers surveyed other published estimates of stone-tool densities in other areas of Africa.There is very little data about the samples tested by Oxford, Zurich and Arizona: no chemical analysis has been published and most of the photographic evidence is not sufficiently detailed.However, further evidence of encrustation is visible in the Oxford photographs.14 Below is a comparison of the 3 samples tested at higher magnification (the Shroud, Thebes and Nubia).For example, some parts of the Nubian Desert average 12 million artifacts per square kilometer.They also calculate expected stone production given certain assumptions about population size and stone tool use over time.Chatham is one of only three homes visited by both Washington and Lincoln, with Mount Vernon and Berkeley Plantation being the other two.

I am deeply indebted to them for sharing their knowledge, wisdom and advice.

The final owner of Chatham, John Lee Pratt, willed the home and its remaining 85 acres to the National Park Service in 1975.

Learn More The last hand-poled ferry in the United States can be found in Scottsville, Virginia, 25 miles south of Charlottesville.

That is pretty much what the scientific method is all about – systematically controlling for all possibilities, all confounding factors, all variables and all alternative interpretations.

We feel more confident when multiple lines of evidence converge on one explanation, and when rigorous attempts to disprove that explanation fail.

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