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Women go to the bathroom together because in our hunter gatherer days roaming the Savannah, if you squatted to pee you couldn't see a predator coming in the long grass. So you needed somebody to stand up on the lookout.

And if evolutionary psychology is not your style, here's a take on the selfish gene. The purpose of the human organism is for shit to make more shit.

(btw, these were just jokes, I don't think anybody makes these in earnest)

I like the corn model myself. corn found the most powerful military in the world, and integrated itself tightly into that nations political system. So not only is corn cared for, grown and harvested at a level far beyond a lawn, but it's also powerfully defended politically and militarily.

trgn is talking about "just-so stories"

https://en.wikipedia.org/wiki/Just-so_story

http://rationalwiki.org/wiki/Evolutionary_psychology#Common_...

http://www.amazon.com/Demonic-Males-Origins-Human-Violence/d...