We are unconsciously learning things by what we see and that's why infants mimic their parents behavior. When they smile to them, they smile back.
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My brother was listening to his transistor radio. He kept switching the earpiece from one ear to the other, which I thought was his idea of a joke. 'You can't do that,' I said. 'You can only hear out of one ear.' 'No, I can hear out of both,' he answered. And that was how I discovered I was deaf in my right ear.