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sound waves
Soun is vibration transmitted through a solid, liquid, or gas; particularly, sound means those vibrations composed of frequencies capable of being detected by ears.
Trivia about sound waves
The science of acoustics studies how these waves are created, transmitted & received
(Sarah of the Clue Crew tugs a string in a cup.) The paper cup seems to laugh because the wet string is transmitting vibrations that form these waves inside the cup