>> Even so, 10x higher still seems rather large. I would have expected 
>> something more like a few percent denser.
> 
> 
> http://en.wikipedia.org/wiki/Avogadro%27s_number

There are 6.03 x 10^23 atoms in 12 grans of Carbon-12.

[A fact which our Java lecturer disputed. He was trying to claim that 
the range of a single-precision float is "oh, more than the number of 
atoms in the universe", and thus you don't really need double-precision.]

I'm not quite sure how that's relevant here though.

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