The Math Myth expands on Andrew Hacker's scrutiny of some widely held assumptions: that mathematics broadens our minds; that mastery of arcane concepts - cosine, logarithms, the area of a sphere - will be needed for most jobs; that the Common Core's single format should be required of every student. He worries that a frenzied emphasis on STEM (science, technology, engineering, and mathematics) is diverting resources from other pursuits and subverting the spirit of the country.