Of Celsius and Fahrenheit
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Tell a doctor in the U.K. that you're running a fever of 102°, and he won't believe you—because 102° Celsius is equivalent to 216° Fahrenheit, which means your brain would be fried faster than that egg in the old "...this is your brain on drugs" commercials.
And if the local news reports that tomorrow's temperature will be around 32°, that's means it'll be shorts and T-shirt weather, not time to buy a down parka—32° degrees Celsius is 90° Fahrenheit.
Now, that said, there are still some old timers (and political, anti-metric holdouts) who talk about temperatures in terms of Fahrenheit, but for all practical purposes the Brits have made the switch to metric here—certainly in news reports and the like.
The bad news about temperatures is that there is no simple formula to convert Celsius (sometimes called "centigrade") to Fahrenheit and back.
There is a formula, of course, but it ain't the sort of thing you'd want to do in your head.
Take the Celsius amount, multiply it by 1.8, then add 32.
See, wasn't that easy?
If math is one of the things you're taking a vacation from, the chart on the right can help you ballpark things.