Scientists seem to be VERY confident that general intelligence cannot change throughout your life. I know one piece of anecdotal evidence isn't substantial, but as I developed through my teen years I felt a drastic change in my ability to grasp concepts and understand the world around me. I went from being the class idiot (easily bottom 15 percentile or lower) taking the lowest level math class my high school offered, to then suddenly taking AP calculus the next year. They only let me take it because I took a course over the summer at a local college to prove my ability.<br><br>I'm thinking maybe it was some shift in gene expression? It was an incredibly surreal time period of my life, as if I went from being asleep my entire existence to finally waking up. It was compelling enough to notice the effect as I was in it, and to this day it is compelling enough for me to write this comment about it after he claimed 'G' is stagnant,(reply>), Actually, the (fairly well supported) idea that IQ heritability increases with age, from ~0.5 to nearly 0.8, requires that IQ changes throughout life. Basically, environment tends to play a bigger role in childhood, so people relatively disadvantaged in childhood will tend to see rising IQs and many precocious people will observe declines. The issue is really that general intelligence is extremely hard to increase for adults, coupled with the fact that much of the environmental factors in childhood aren't obvious (I'd guess kids developing at different rates accounts for much of it).,(reply>), You had sleep apnea that somehow cured itself? Or some other disease that your immune system finally managed to rid you of?