DEVICES

Ever wondered how that thing works? Explore the inner workings of many common devices and inventions, as well as those that aren't so common, such as compasses, gyroscopes and bug zappers.
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10 Inventions by Thomas Edison (That You've Never Heard Of)

It's common knowledge that Thomas Edison invented the incandescent light bulb and the phonograph, but did you know he also developed concrete furniture and a phone to communicate with the dead?

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31-40 of 42

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