>>There's the other study which showed how speaking multiple languages keeps your wits sharp longer. Helps delay the progress of senile dementia. So it may also help during development - if you're in a mix, you have to speak languages, you have to use more of your brain, you do more mental pushups, and you generally develop the brain muscle. Which then makes you smart enough to beat any IQ testing :).
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>Are you put yourself... :)
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>I see you're an expert in english plus your native language serbian...

Plus Hungarian and Russian, plus bits from other languages. And I probably know about a couple of hundreds of Turkish words, and maybe another hundreds I don't know are Turkish :).

Not that I think that it makes me much smarter - it just prevents me from losing it too soon :).