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A light bulb lights up when electricity is applied, and it has a bulbous shape.

Q. How do people know how a bulb looks in the past years it has changed and and it has diffrent shapes.

A. The same way that they know that a phone dial was called a 'dial' because it was a circular like the face of a watch. Oh, right.

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11y ago
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Q: Why is a light bulb called a light bulb?
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