The folding a piece of paper to the moon puzzle is a powerful demonstration in exponential growth. Here's the question for this brain teaser: How many times would you have to fold a piece of paper for it to be thick enough to reach the moon? To solve this, you must know that the distance between the Earth and the moon is 384,000 km. The piece of paper you're theoretically folding only measures 0.1 mm in thickness. Watch the video below to see how this brain teaser is solved, or scroll down for the answer.