The things I’ve learned from taxi drivers would be enough to fill a book. They know a lot: they really do get around. I may know a lot about Antonioni that they don’t know. Or maybe they do even when they don’t. There are various ways of knowing by not-knowing. I know: it happens to me too. The crônica, a literary genre peculiar to Brazilian newspapers, allows writers (or even soccer stars) to address a wide readership on any theme they like.…