I found today some instructions on how to build an earsplitting air horn using simple materials: Balloon or Latex Glove, Medicine Bottle, Rubber Band, Straw or cylindrical hollow object that can fit inside the medicine bottle.

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When you are at night and use your computer sometimes seems a little too difficult to see the keyboard. And from what I know a lighted keyboard costs over $50 so why not illuminate your normal keyboard under $5?

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