We've all heard the old adage "practice makes perfect," but new research suggests that spending a lot of time on an activity is not in and of itself a formula for success. A study published in the journal "Intelligence," which analyzed high-performing chess players and musicians, found wide variations in the time it took to reach a level of mastery, leading researchers to the conclusion that other factors -- such as intelligence, starting age and simple genetics -- also play a role in perfection.

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