Discovering Science 5

Bet you can't fold a sheet paper --- any paper --- in half more than nine (9) times! The way the layers of paper included in a fold increases is called a "geometrical progression". On the first (1) fold, you have two layers of paper. On the second (2), four. The third (3) fold creates eight layers. But the time you get to the seventh (7) fold, you already have 128 layers. It's like trying to fold a book!