>> Kate does 116 if I have counted correctly:
>> http://www.youtube.com/watch?v=kZSHr5E7fZY
> 
> How many digits of pi do you need before your calculation of the volume 
> of the universe is off by no more than the average volume of a water 
> molecule?

50 digits allows you to compute the radius of the observable universe to 
within the diammeter of a hydrogen atom.

As for whole water molecules, and volumes rather than lengths, I can't 
say off the top of my head.

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