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You may have played with this toy when you were a child. It's called a slinky. You can use it to create an experiment that Science Guy Jason Lindsey calls a sound blaster.

n 18-ounce plastic cup n Metal Slinky n Pipe cleaner n STEP 1: Hold the top ring of the Slinky to the bottom of the plastic cup. n STEP 2: Gently swing the Slinky back and forth, allowing it to hit ...