Twenty can't be expected to tolerate sixty in all things, and sixty gets bored stiff with twenty's eternal love affairs.
But in fact, when you try to model that on a computer you find that because of the very structure of matter and of the chemical bonds that are the basis of every organism, evolution is not random at all. It will tend to follow certain paths.
I like films that are well-written and concise and with not a lot of room for improvisation.

