Make a homemade hearing aid - collect sound vibrations using a paper cone - Reeko's Mad Scientist Lab
Everything that moves makes a sound by causing vibrations or movement of air. If you don't believe this, next time Dad is kicked back in his easy chair watching TV, sneak up behind him with two metal pots and bang them together real hard. Now listen carefully to the whooshing sound as Dad flies out of his chair and runs towards the door.
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