My little cousin was very excited to tell me that they had constructed a telephone artifact made out of cups and string. I remembered that I used to play with this too when I was young, and I thought about how it works. When you talk into your end of the "phone" (the cup), the sound waves hit the cup, make the cup vibrate, which then travel through the tight string by pulling it back and forth. The waves arrive into the other end of the phone, where they make the other cup vibrate just like the first cup did. The tighter the string, the better it carries the sound to the other cup.
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