Coincidentally, I just listened to a long voicemail message from DS6's teacher. I had sent in a note asking her if we could come up with a plan to help his organization since he has been forgetting to bring home assignments and losing things. In her message, she said that "organizational problems are really common in bright children". Sounds like, if there's no evidence of this, there's a myth floating around. I've heard the same thing said about smart people and bad handwriting (I do hope this is true, since my handwriting is dreadful...

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