Healthy teeth are wondrous and priceless: Dentist explains why and how best to protect them
At an auction in England in 2011, one of John Lennon's teeth sold for just over US$31,000.
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At an auction in England in 2011, one of John Lennon's teeth sold for just over US$31,000.
4 minutes ago
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Experts often highlight social media and harsh economic times as key reasons why young people are getting unhappier. And while those factors are important, I would like to emphasize another.
Apr 11, 2024
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A sensor (also called detector) is a device that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument. For example, a mercury-in-glass thermometer converts the measured temperature into expansion and contraction of a liquid which can be read on a calibrated glass tube. A thermocouple converts temperature to an output voltage which can be read by a voltmeter. For accuracy, most sensors are calibrated against known standards.
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