Riddle of Intelligence

There is little agreement today on what it takes to be intelligent. Yet this word is widely believed to be about something real, mostly biological, and important. From this popular perspective, intelligence is also something you can have a lot of, and luckily find yourself being labeled as a genius. Or sadly, something you do not have nearly enough of, and so find yourself being seen by others, at least behind your back, as silly, stupid, or plainly idiotic. Looked at closely, however, it turns out this word belongs more in the realm of traditional folklore than modern science.