Have you every thought of practicing to be a genius at anything? Several gurus in intelligence, claim that endurance and hard work get higher grades than raw intelligence scores from IQ tests. Do you agree? Einstein claimed he was no more intelligent than others - but he stayed with problems longer . You? Ericsson calls this the 10-year-rule. Simply put, it takes 10 years or 10,000 of committed practice to master complex skills. You may remember Anders Ericsson ’s work from its reference in