From oversized socks filled with treats to firs in living rooms and strange stories and songs, Christmas makes us all scratch our heads now and then. Now You Know Christmas will help everyone make sense of the holiday season, with answers to questions like:How fast would Santa have to travel in order to deliver toys to all the children in the world in one night? Why are Christmas songs called "carols"? Why did the Wise Men bring gold, frankincense and myrrh as gifts?