A fudge factor is an ad hoc quantity or element introduced into a calculation, formula or model in order to make it fit observations or expectations. Examples include Einstein's Cosmological Constant, ...

How do we lie and then sleep at night? Behavioral economist Dan Ariely says it¿s all about rationalization¿what he calls ¿the fudge factor. Premieres Thursday, May 28 10p ET/PT. Got a confidential ...