London. I visit the British Library, a barrier-free temple of books, located near St. Pancras and King's Cross stations. Its motto: "Open to everyone and free to use." It houses 170 million works. A thousand years of evolving culture. In the treasure room, everything from Beatles sheet music and lyrics to the country's political emblem, the Magna Carta (1215), written in Latin, whose title was Magna Carta Libertatum, that is to say, Great Document of FreedomsThe precedent for modern constitutions.