Genetic influences help determine intelligence. But how? Nerve axons are encased in myelin — a fatty sheath of "insulation" that allows for fast signaling bursts in our brains. The thicker the myelin, the faster the nerve impulses. Researchers at UCLA think that the thickness of the myelin sheath is determined genetically. Which kind of kills the theory that you can wear someone down to their last nerve.
On the plus side, if being encased in a fatty sheath of insulation is the key, I've got to be up there with some of smartest people on the planet!
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