Sometimes you get illuminated by the clarity of a Darwinian vision when you see people behaving in a manner that makes it clear that this is nature at its best.

So watch mothers and fathers in a playground with their kids and watch the love that they give the kids and watch the glee that the children have when they come running back to the parent for reassurance. 

These are behaviors that are not really taught.  They’re easy to learn.  They’re there and if you’re a comparative biologist you look at this and you say "Isn’t this great?" You go to a park on the Upper West Side or in Cleveland or in China and you see exactly the same behavior because you know what - same organism.  

In Their Own Words is recorded in Big Think's studio.

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