Aging is an inevitable process. I surely wouldn't want to grow younger. The older you become the more you know your bank account of knowledge is much richer.
Human relations are built on feeling not on reason or knowledge. And feeling is not an exact science like all spiritual qualities it has the vagueness of greatness about it.
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I do think we know that a teacher who knows what he or she is doing knows their subject matter and knows how to impart knowledge to kids is a critical piece of closing the achievement gap.