What do you think?
here's my assumption: Left handers are not smarter, it's simply that they think away from the norm, in other words, DIFFERENT. You might ask, what is the "norm", and how would we define it? Here's how I would explain it:
In a Chess game, a right hander migth start with a very logical/subtle move, say the English, or King's Pawn opening, but a left hander might not respond "properly". Instead of the "correct" response of e5 or such, the leftie plays a6 or b5 which might surprise his right handed opponent...As the game goes on, the left handed player begins to dictate the game's position and pace that discomforts the right hander, which will eventually causes the right hander to fumble.
Now, here's a problem that might spark interests for some of you. What if the world is the opposite? Which means that the majority of the human pop. are left handed, will the world be a better/different place? Or will it simply be the same place?