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1.
Constant factor in anything we do.
Cause for most of social, economic, psychological, political, military, etc. problems and blunders.

For great human errors see: "Dubya" and "communism".

For the opposite see: "Hal 9000"
Hal 9000 in incapable of human error, it's a bloody machine!
by n008a April 12, 2009