The metric system

Miles and kilometers, feet and meters, and so on

Pounds and kilos, grams and ounces, stone and tons (and tons, and tonnes)—Deciphering weights in Italy

Gallons and liters and how to order wine

Of Celsius and Fahrenheit

When to use the 12-hour or 24-hour clock, and what time zone Italy is in

I'm a size what? European clothing sizes measures and shoe sizes and how to convert American clothes sizes to European (and British) ones