Quote Originally Posted by Aemilius Paulus View Post
And speaking of the molecule thing, that is horse-sheisse. Poor science there. Too much bloody water on this wet planet fro that to happen. The chances are small. Iskander lived a much shorter life than Caesar. Then again, he drank like ten Makedonians, which would equal about fifty Romans... No wonder the real Greeks looked down on Makedonians. No truly cultured person would do such thing to himself.
Quote Originally Posted by Andronikos View Post
Are you speaking about the probability of finding a molecule of water that was drunk by some special person in your glass? Well, it's quite easy math. The number of water molecules on The Earth is approx. 10^45, just calculate the number of molecules drunk by one person during life, number of molecules in one cup and how many cups do you have to drink to find one. The only mumbojumbo there is that you assume that the water has perfectly mixed since being drunk by that person.
Believe it or not you would drink 861729 molecules of water a day that were once consumed by Alexander the Great.
Spoiler Alert, click show to read: 

1.36*10^21 litres of water in the world

Alexander lived for 12013 days ( 20 July 356 BC to 10 June 323 BC)

assuming 3 litres per day was consumed on average gives 36039 litres

Then over his lifetime he consumed 3.9065*10^26 molecules (from FM of water = 18g and avagadro's number)

That gives 287243 molecules per litre. Now multiply by average daily consumption (3 litres)

Gives 861729 molecules per day.