I've always been curious about this. I scored 136 on an IQ test when I was in third grade, but have since wondered if it was a fluke. I am able to identify that i'm more intelligent than (probably) 90% of the people I deal with on a daily basis, but my life's trajectory hasn't necessarily followed that of somebody with an IQ of near 140. I do, however, tend to be rather lazy because most things in life come relatively easy to me. What part does "nurture" have to play in how IQ changes, and how far off in either direction can an IQ test be? Did I just "get lucky" when I took my test, or is my IQ really 136 +/- a standard deviation?