The binary system strikes again, McGrath. And you've reminded me of another area, with considerable folklore, that has resisted SI terminology. Although metrication has been assiduously promulgated in Oz since the early 70s, and has been more or less de rigeur in scientific circles for longer (although I routinely gave conversions when writing up my researches), ask any mother how much her child weighed when born.

I'll bet a decent magnum of champoo that, unless the mother comes from a country where SI is supreme, almost every one will give the bub's birth weight in pounds and ounces Avoirdupois, even though the delivery suite staff will have measured it in kilograms. All the scales where my daughters were born had both scales but the folklore is all in lbs &oz. Still!

Cheers, Rowan