Ray_afraid and moviefreakedmind, thank you for sharing your experience, however I cannot relate to it. As you said, you just thought you were smart (despite evidence of contrary) and then eventually realised you are not. On the other hand, I was always a scientist and questioned everything rigorously. When I was a kid I was reluctant to just conclude I am smart, despite various clear evidence supporting that. But after 30 years of various clear evidence I just eventually had to conclude the obvious.