Warp wrote:

>   The difference is that measuring apple pips in kilograms is rather easy,
> even without any tools. Measuring nanograms of botox is extremely difficult,
> even with really sophisticated tools.

Measuring out one nanogram of liquid is very hard.

However, I rather suspect that what they *actually* do is take (say) 1 L 
of pure botox and mix with 9 L of pure water, then take 1 L of the 
mixture and add it to another 9 L of pure water, then... recurse a few 
times and you can create a water/botox mixture of very precise 
concentration without having to actually measure anything particularly 
accurately.

(Sorry... my dad actually works in a lab where we routinely make up 
solutions of, say, 4 ug of aspirin per L of liquid.)

-- 
http://blog.orphi.me.uk/
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