: The fold creates a pocket that catches air. When snapped downward quickly, the pocket flips out, causing air molecules to "bang" together and create a sound wave.

: You only need a single sheet of printer or A4 paper.

Check out these tutorials to learn how to fold and use a paper popper correctly for the loudest sound: How to Make a Paper Popper (VERY EASY!) YouTube · Julien Aerono

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