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Physics in Speech
Some science about speech, "including some notes about helium speech." Features diagrams, audio of ordinary and helium speech, and links to related articles. The site notes that due to risks of inhaling helium, "it might be better if you don't do the experiment yourself: just listen to the sound files." From the School of Physics at the University of New South Wales, Sydney, Australia.
http://phys.unsw.edu.au/phys_about/PHYSICS!/SPEECH_HELIUM/speech.html
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