“Suppose a single modern battleship got transported back to Columbus’ time. In a matter of seconds it could make driftwood out of the Niña, Pinta and Santa Maria and then sink the navies of every great world power of the time without sustaining a scratch. Five modern freighters could have taken onboard all the cargo borne by the whole world’s merchant fleets.5 A modern computer could easily store every word and number in all the codex books and scrolls in every single medieval library with room to spare. Any large bank today holds more money than all the world’s premodern kingdoms put together.6”