One curious feature of our times is the co-existence of a nearly unimaginable rapidity of communications with an at-times slow, even glacial, movement of ideas. Narratives that have lost any genuine explanatory power, along with the biased historical scholarship of earlier centuries, have become entrenched in the minds of millions, seemingly immune from being dislodged. Such simplistic queries as "What about Galileo?" "What about the Crusades?" are...