Units & Measurement
Where units of length, weight, volume and temperature come from, and who still uses them.
Inches, Feet, Miles and Meters: Where Length Units Come From and Who Uses Them
The origins of the meter, inch, foot, yard, mile and nautical mile, and which countries still measure in feet and miles today.
Fahrenheit, Celsius and Kelvin: Where Temperature Scales Come From and Who Uses Them
How Fahrenheit chose 32 and 212, why Celsius was originally upside down, what Kelvin measures from, and which countries still use Fahrenheit.
Cups, Pints, Gallons and Liters: Where Volume Units Come From and Who Uses Them
Why US and UK gallons and pints are different sizes, where the liter came from, and how cups and tablespoons vary from country to country.
Pounds, Stone and Kilograms: Where Weight Units Come From and Who Uses Them
The history of the kilogram, pound, ounce, stone and ton, why pounds are written "lb", and which countries still weigh things in pounds and stone.