'(<a href="http://www.j-archive.com/media/2009-07-17_DJ_19.wmv">Sarah of the Clue Crew tugs a string in a cup.</a>)  The paper cup seems to laugh because the wet string is transmitting vibrations that form these waves inside the cup'
sound waves
TRICKS ARE FOR KIDS: The paper cup seems to laugh because the wet string is transmitting vibrations that form these waves inside the cup
The paper cup seems to laugh because the wet string is transmitting vibrations that form these waves inside the cup
The paper cup seems to laugh because the wet string is transmitting vibrations that form these waves inside the cup
TRICKS ARE FOR KIDS
sound waves
TRICKS ARE FOR KIDS