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Space Audity
Twenty Thousand Hertz
The Mystery Sound of a Manual Credit Card Machine
As we head into a new era of space exploration, maintaining fast and reliable communication with Earth will be crucial. If you know that sound, go to the web address mystery.20k.org and let us know. You'll be entered to win one of our new 20,000 Hertz T-shirts. That's coming up after the break.
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