Chronicles of a Cairo BooksellerBy: Nadia Wassef The streets of Cairo make strange music. The echoing calls to prayer; the raging insults hurled between drivers; the steady crescendo of horns honking; the shouts of street vendors; the television sets and radios blaring from every sidewalk. Nadia Wassef knows this song by heart. In 2002, with her sister, Hind, and their friend, Nihal, she founded Diwan, a fiercely independent bookstore. They were three young women with no business