"We seldom stop to think how many people's lives are entwined with our own. It is a form of selfishness to imagine that every individual can operate on his own or can pull out of the general stream and not be missed."

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The mind and the body are inextricably entwined, and rarely are their inseparability clearer than when we're under some kind of mental pressure. The moment we start trying to learn a new skill, make a decision or otherwise think on our feet, our nervous system reacts - with accelerated pulse rate, increased respiration, even sweating.

— Jeffrey Kluger