Can a Human Singing Really Break A Glass?
source: http://www.youtube.com/watch?v=JiM6AtNLXX4&feature=player_embedded
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In 2005, the guys on MythBusters brought us the first recorded and confirmed proof that an unamplified voice can break glass. Rock singer and vocal coach Jamie Vendera had the right frequency (556 Hz) and, after 20 attempts, worked up the volume (105 decibels) needed to needed to shatter a glass. (Here’s a link to the MythBusters segment.)
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