Today, more than ever, we are aware of the power of personality. Are we introverted, extroverted, neurotic, open-minded? Psychology has always taught that there are personality types, some advantageous, some not so much, and the common perception is that we are stuck with what we have been dealt. The introvert will never come out of his shell, the narcissist will forever be stuck staring in the mirror (or tweeting endlessly about perceived attacks...