Grinity, you nailed it here... and not to mention that girls will learn to accept this the rest of their lives, causing all sorts of issues, especially mental/emotional ones! I am living proof of that, and I know several other moms around here have similar stories that can be traced back to being bored in grade school...
I shouldn't have implied that all boys will complain - a few boys will go the 'internalize' route. I know them. They are real, but so few.
I really really believed my teachers when they told me that being bored wasn't a problem, and that I should try harder to like my agemates, and pay attention in class. Sometimes I think that my brain's amazing abiltiy to change channels at the drop of a hat is 'induced ADHD' that I trained myself not to dwell on any one topic for any length of time because I was trying not to brood. It wasn't until my son went to school that I finally had words for 'what was wrong with me' and that I finally finally understood that it wasn't all my fault. Where were the swans when I needed them? Even in college, I just assumed that all my interesting friends were much smarter than I was. Sigh. I am so grateful that my son was able to show me the way. He has no confusion whatsoever about deserving to be taught even in elementary school.
Smiles,
Grinity
And funny about the induced ADHD... I actually take ADD meds, and was technically diagnosed with it, but as an adult. And now, though the meds help me focus, I realize that most of it is due to issues pertaining to my giftedness and education (or having it "easy") growing up!