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Shaping a Theory on Whip Cracks

Published May 31, 2002 at 9:00 PM PDT

Math professor Alain Goriely says he's figured out why whips make a cracking sound -- it's the mini sonic boom that's created by the arc traveling along the length of the whip. Goriely explains his findings to Scott Simon for Weekend Edition Saturday.

Copyright 2002 NPR