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).

212°F is the boiling point of water at sea level. The scale is widely used in the United States, some Caribbean countries, and a few others. It remains common in weather reports, household ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

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 ...

Celsius is the obvious temperature scale of choice when conducting scientific experiments. Water freezes at 0. It boils at 100. It is beautiful and simple and has a lot going for it, not least of ...

LOUISVILLE, Ky. — News of COVID-19 vaccines and deployments have taken over the headlines in recent weeks, and various numbers have been thrown at us: the efficacy, how many doses are needed, and ...