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Ever heard of Maslow’s Hierarchy of Needs? This is a model for human motivations – the things that drive us to do, well, everything we do. His idea was the most basic needs were met (food, sleep, sex, safety) then it frees us up to pursue more and better things (mates, health, self actualization).
Well, some clever folks have revamped it and for the better, in my estimation. They’ve added parenting to the top of the pyramid. They think that the ultimate “need” to be met, after everything else, is raising children.
You can learn more here – and see the new pyramid – it’s interesting stuff!
http://www.eurekalert.org/pub_releases/2010-08/asu-mpg081810.php