Hmm, good for usage you say. Ok, let's stick to "standard" imperial units. How many feet in a yard? Yards in a mile? What the hell is a quart? And since base 12 is great, what is 12 feet called? 144 feet? A 12th of an inch?
Or, ounces: How many ounces in a gallon? A pound? And how many _kinds_ of ounces are there, anyways?
It's a twelfth of a troy pound, or Roman libra (lb).
These two episodes from The History of English podcast trace these seemingly arbitrary units through history and give them some context. My favorite is the derivation of 5280 feet per mile. Also, that "mark twain" is a depth sounding of two fathoms.
Or, ounces: How many ounces in a gallon? A pound? And how many _kinds_ of ounces are there, anyways?
Fun fact: The term “ounce” is of Latin origin from the word “uncia” which means “a twelfth part.” http://www.differencebetween.net/science/mathematics-statist... So...what's an ounce a twelfth of?
Or, say, a pint. What's the definition of a pint?