I absolutely am not going to argue about this, because it never ends in peace and harmony, and setting fire to people is rude. I know there is such a thing as ADD, because I've seen it in action all my life. The males in my father's family don't escape it; it comes either with or without hyperactivity about 50/50. Only-children lavished with attention do come out ahead, in that at least someone is paying attention, but the ADD is STILL THERE. Just as surely as it is there in the family with 5 kids, getting minimal attention.

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It is hard to convey five-dimensional ideas in a language evolved to scream defiance at the monkeys in the next tree. -- The Science of Discworld III: Darwin's Watch, by Terry Pratchett, Ian Stewart & Jack Cohen