This just shows how subjective and difficult "intelligence" is to define. Einstein was notoriously absent minded and often forget when he set down something that was in his hand minutes ago. His weak abilities at rote memorization helped him flunk his college entrance exams. But....once he got a subject down his incredible imagination and intuition took him to wonderous hights. Many consider him the most "intelligent" person of the 20th Century. In reponse to this Einstein retorted that "imagination is much more important than intelligence."
That sort of validates my observation over time that fans of Science Fiction tend to have above average IQs.
My ex was extremely clever, but dumb as a box of hammers. But she was a neat OC and she thought Scifi is a total waste of time.