I consider myself pretty conversant in metric units. I know that 20 kilograms is 44 pounds (double it and add 10%) and that five kilometers is a little over three miles (I’ve, uh, run a lot of 5Ks).

If you’ve ever traveled abroad or heard a story about a cold blast or a heat wave hitting another country, you've likely heard the temperature in degrees Celsius. A hot day would be close to 40 ...

Every once in a while, you may see a temperature in Celsius instead of Fahrenheit. Your car thermometer may revert to the wrong system and you don’t know how to change it, for example. Since almost ...