IQ =/= Practical Knowledge. Just stating that if you have a high IQ it doesnt make you a genius.
Which reminds me of something pretty obvious:
You can't really be "The smartest person in the world."
Everyone has his strong sides in intelligence.
Example: Person1 studied in physics, hence he knows more about newton, law of gravity and what not.
Person 2 studied in IT, hence he knows more about computer technology.
So all in all, everyone has his strong and weak sides.
My own? I'm good in computer programming and technical research and development. My weak side is language (Dyslexia) and management. (Paperwork etc.)