Decades of quantitative research in the field of personnel psychology have shown that across fields of employment, measurements of "general cognitive ability" — which is another way of referring to the old-fashioned concept of intelligence or IQ — are consistently the best tools employers have to predict which new employees will wind up with the highest performance evaluations or the best career paths

More than 86% of people at Google have a college education (or more), and most of them come from the most elite schools.