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					Originally Posted by  Toehammer
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				The only logical argument for astrological personalities I could ever think of is that certain people who are born during a season, for example winter, might have lower melatonin or Vitamin D intake in (perhaps a critical?) first stage of their life, compared to someone born during spring/summer.  I have no idea about infant vitamin research, so this idea may or may not be true.  But at least it has SOME logic built into it. 
			
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 Well there is also the school system.  For example some boys will be up to 11 months older, which means in general they will be stronger/more developed at all points and thus more prone to leadership/success.  Your hormones actually reflect your actions, so if you act like a leader you'll get more testosterone.  I remember a study where they had couples gaze dreamily into each others eyes for 15 minutes or something; apparently this lead to quite a few dates 
[You must be logged in to view images. Log in or Register.]  This is also why we have so many masculine women in the US; when women are put in leadership/competitive positions the testosterone starts flowing as the body adapts.
Also my understanding of central limit theorem was that the sum of a series of N iid random variables had the same variance as any individual variance.  I did a test of this though and with the lisp pseudorandom number generator the deviation goes as roughly sqrt(n).  So I guess I need to review my old college statistics somewhere.