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===Wavelength and the speed of sound===
 
===Wavelength and the speed of sound===
 
Measure the wavelength and hence the speed of sound using 2 OLPC XO laptops, one runs Turtle Art the other Measure, inspired by http://www.ted.com/talks/lang/en/clifford_stoll_on_everything.html
 
Measure the wavelength and hence the speed of sound using 2 OLPC XO laptops, one runs Turtle Art the other Measure, inspired by http://www.ted.com/talks/lang/en/clifford_stoll_on_everything.html
<iframe width="420" height="315" src="http://www.youtube.com/embed/l3vKVTW1LQA" frameborder="0" allowfullscreen></iframe>
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http://www.youtube.com/embed/l3vKVTW1LQA
    
===Gliding tone===
 
===Gliding tone===
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