Eight-year-old David Bernstein discovers life is much more exciting when he calls himself Ali Baba Bernstein. Only Ali Baba would have dared to grab the class snail and escape to the boys' room for his own magic experiment. David would never have invited every David Bernstein in the phone book to his birthday party -- or find himself hailed as a great detective -- or discover adventures and misadventures everywhere he went. But Ali Baba Bernstein does