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40 degrees Fahrenheit or 0 Celsius number lettering on icy glass covered with ice and frost. The concept of extreme cold weather Stock Photo - Alamy
![Who Invented the Fahrenheit and Celsius Temperature Scales and What Zero Degrees Fahrenheit Signifies Who Invented the Fahrenheit and Celsius Temperature Scales and What Zero Degrees Fahrenheit Signifies](http://www.todayifoundout.com/wp-content/uploads/2014/12/Thermometer.png)
Who Invented the Fahrenheit and Celsius Temperature Scales and What Zero Degrees Fahrenheit Signifies
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