haven't we gone thru this route before?
>
> b.} who knows what a hectare is? Sure it's 10,000 square meters .. OK so
> what does 10,000 square meters look like?
>
>            Oh! You say a hectare is about 2.4 acres! .... Good let's use
> acres.

what's an acre? if you make it square, how big is a side? how many feet are
in a mile?
>
> c.} who knows what a Pascal is? so what is hertz?

what are the archaeological applications?

>
> e.}  who can remember meters, cm, mm, decas, pico, nano, micro, milli,
> kilo, mega, giga, tera.

i do

>
>             What ever happened to 500 {inches} & 0.004 {inches} &
> 0.00000000347 {inches}

how about yards, furlongs, fathoms, barleycorns, 12 inch feet vs 1/10ths of
a foot... it's all relative

>
> f.}  my door is 6' 6"
>
>             SI doors are 198.12 cm

depends on where you buy your door - and my roman door will be different
than someone else's medieval door vs your typical bronze age hut...

>
> g.}  pray we don't go to war .. in WW II, a pilot would yell .. "Bogies @
> 3 O'Clock!"
>
>             Now the poor pilot will look at his digital watch and it'll
> only be 2:30 ..

you didn't mention the metric (400 degree) circle -