IQ is probably the most predictive factor of success in our knowledge-first society. The catch is that IQ is a fuzzy variable: its measurements heavily depend o

IQ is probably the most predictive factor of success in our knowledge-first society. The catch is that IQ is a fuzzy variable: its measurements heavily depend on one's mood, the particular IQ test, the food one's eaten that day, hours slept and so on. However the highest measured IQ in ideal conditions is pretty stable.