A Moment of Science
All you need for this trick is a twenty-five-cent piece and a small postage stamp. Put the stamp on the desk and hold the quarter horizontally about half an inch above the stamp. Now blow hard down onto the quarter.Now blow hard down onto the quarter.
Until recently, most black boxes worked like tape recorders, using magnetic tape to record voice and electronic data. Current manufacturers use solid state memory boards, like the kind used in personal computers.
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