Design can never be an ultimate explanation for anything. It can only be a proximate explanation. A plane or a car is explained by a designer but that's because the designer himself the engineer is explained by natural selection.
It goes without saying that you should never have more children than you have car windows.
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As soon as I get my car I think I'll be going to the cinema more. Since I don't go very often there are no films that are a must see at the moment. I usually wait till they come out on DVD.