Why is Australia often referred to as being "down under"?

Who was Marie Curie? Who was Confucius? Did George Washington Carver invent peanut butter? We at World Book answer all of your questions about people—and things that aren't people, like places. Answer Me This, World Book answers questions about such topics as technology, outer space, and animals, too. We help you make sense of the world with informative and funny answers. Well . . . at least we think they are funny.