Celsius Versus Centigrade: Anders Celsius was a Swedish astronomer who invented a thermometer based on the boiling point and freezing point of water. We know a slightly improved version of his thermometer by the Celsius name and by the word "centigrade." This centigrade thermometer was named in honor of Celsius in 1948 at the ninth International Conference of Weights and Measures.

'Between' Versus 'Among': Many people believe "between" should be used for choices involving two items and "among" for choices that involve more than two items. That can get you to the right answer some of the time, but it's not that simple. The traditional rule you learned is actually a myth.

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