Great men (and women) are overrated and idealized. In most cases all the ideas and inventions and such attributed to them can be found in other people who have no place in history. They are great, sure. But what makes a great person over a person who history forgets is often a matter of being in the right place at the right time.

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"Man lives in the sunlit world of that which he believes to be reality. But unseen by most is an underworld, a place that is just as real... but not as brightly lit... A DARK SIDE!"
-opening from Tales From the Darkside