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Smoking can be very detrimental to IQ as it damages blood circulation and affects the amount of oxygen delivered to the brain.

Modern neuro-imaging techniques show that to some degree brain size is correlated to IQ.

IQ has been shown to increase with more schooling, better educated parents and better toys.

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What is fael spelt backwards?

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Neale diamondesays...

"IQ has been shown to increase with more schooling, better educated parents and better toys." Not surprising!