Children are remarkable beings.
They have the ability to think and communicate their thoughts and feelings, but without temperament or the wisdom that comes with adulthood. They are endlessly adaptable. A child raised in France through, say, age 6 can speak fluent French, then emigrate to the U.S. and speak colloquial English in just a few years. The other remarkable thing about children is that they give us a looking glass into our own genetic predispositions - without the soon to be acquired social constraints of morals, ethics, and law. Sometimes we can glimpse two million years of genetic evolution on a playground.