I think that is not a thing of being Smart, because anyone with certain determination can solve the cube, Is a thing of affinity, the last year i meet a guy, i explained him for around two minutes how to solve the cube, then i gave him the cube, his first solve was of 1:30.00!!!, but he is not a genius at college, no way... i only have two explanations for this 1) good fine motricity, developed mostly due to fast typing on the old msn messenger (he can do (R'D'RD)x6 in around of 2,5 seconds and he is a begginer) 2) good visual memory, developed maybe in a game called brain buddies... the fine motricity plus the good visual memory equals to a higher affinity with speedcubing, but wait!, being smart is more than fine motricity and visual memory, isn't it?