I've noticed a pattern with myself and others, that we've started out very smart(IQ about 120-150) in grade school, and then by the time we're around 17 or 18 our IQ has dropped to the normal range (100-120).
When thinking of the cause for this, my mind flashes on the ubiquitous bumper sticker: "My kid beat up your honor student." Being smart is not often a trait that gains one social popularity, so not only do we learn to hide it, we learn to hate it and kill it.
