Never knew. As it should be. Don't you miss cheese?
The veggie I work with is addicted to cheese.
Was needed as early computer systems worked in centipounds and converted for printing, I never understood it, and thought it was an adbomination.
LSD, my centre is locking not limited slip.
My main use of imperial is of full sized railways.
Weights, I find kg easy, volumes, I know the size of 90l, 80l would fit in a tank internal dimensions of 400mm x 200mm x 100mm.
Width inside imperial, width outside metric, profile a ratio, sidewall a code. Tyres.
cm are evil, use mm