A girl who was just learning to drive went down a one-way street in the wrong direction, but didn't break the law. How come? Paul's height is six feet, he's an assistant at a butcher's shop, and wears size 9 shoes. What does he weigh? Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be? Who makes it, has no need of it. Who buys it, has no use for it. Who uses it can neither see nor feel it. What is it?