Space Didgeridoo

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This week astronaut Don Pettit is playing with acoustic oscillators on the space station.  He and Dan Burbank transform some of their vacuum cleaner tubes into didgeridoo-like instruments.  By buzzing into the tube, Pettit is creating an acoustic standing wave, and, depending on the geometry at the far end, the wavelength of the standing wave and thus pitch of the sound is shifted.

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