Here's an interesting story from Tim Hurson, author of 'Think Better: An Innovator's Guide to Productive Thinking':
The great American inventor Thomas Edison had observed ripples on the surface of water in a glass. Of course, this was caused by sound vibrations. [Remember the same phenomenon in the 'Jurassic Park' movie?]
He then made an incredible unexpected connection while daydreaming and seeing these ripples.
He thought: If sound vibrations could make the surface of the water ripple, what would happen if he could somehow freeze these ripples? Could he reconvert them into sound?
Intrigued, he tried it first with tin, capturing the vibration of a needle and allowing it to etch into the soft metal. When he attached a megaphone to the needle that was being vibrated by these etches, he heard the sound!
The world’s first sound recording machine was born. Amazing.
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