G'morning Paul,

 PQ> That's exactly the sort of thing portrayed in the movie.  The way I
 PQ> remember it, the 'brains' of the group in the movie explains to a
 PQ> female on the inability to predict the path taken by a drop
 PQ> or two of water down the outside of a human hand, given
 PQ> differences in: temperature; placement of the drops;
 PQ> whether the hair folicles are upright; etc, etc.  The
 PQ> confluence of these minor variables, making up such a
 PQ> miniscule event, can have an enormous impact to the extent
 PQ> that they ensure an unpredictable outcome.

And worse - if you turn the hand up the other way,  the drop takes 
a different route back to it origin....

And, as they're saying in the latest Mars water speculation, 
"right in front of your eyes"....

Miles.
 
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