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S1:E3 Why Does Breathing Helium Make Your Voice So High?
First Aired: September 26, 1999
Runtime: 30 min
The discovery of how the density of several elements affects sound, what is needed for sound to be present, and how sound works. The pitch of a person's voice compared to that of a musical instrument is discussed, along with how changing the speed of sound affects the pitch of the voice, and how the pitch can be changed.
