If you could fold a piece of paper 42 times, it would reach the moon.
Every time you fold your piece of paper, it doubles in thickness. Assuming a sheet of paper is 0.01cm thick, by the time you've folded it 20 times, it's 1048576 sheets of paper thick, or just over 100m. Fold it 42 times, and it's 4.4 x 1012 sheets of paper thick, or 440,000 km – well over the (average) 384,000 km distance to the Moon.
