Extroverts turn outward. Introverts turn inward. http://www.etymonline.com/index.php?...earchmode=none

Extroverts seem to have an innate advantage in enjoying life. Does this truism belie the assertion all persons are created equal? Is there a design error?

I expect there are trade-offs. Even so, as an unproven hypothesis, it seems the introvert has to work harder to bring meaning into his/her life.