One afternoon in late April 1859 two geologically minded businessmen, John Evans and Joseph Prestwich, found and photographed the proof for great human antiquity. Their evidence -- small, hand-held stone tools found in the gravel quarries of the Somme among the bones of ancient animals -- shattered the timescale of Genesis and kicked open the door for a time revolution in human history. In the space of a calendar year, and at a furious pace,...