Mike is designing a new brand of earphones. He needs to make the ear phones small enough to fit inside a person's ears. But if the earphones are too small, the speakers inside of them will not be able to generate a high-quality sound. Mike also knows that the earphones will be used by people as they exercise. So he needs them to be able to withstand sweat as well as hot and cold weather.
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Mike is designing a new brand of earphones. He needs to make the ear phones small enough to fit insi...
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