Bishop is quite right, many fallacies do exist in the school system because they are considered "common knowledge". For the most part you are taught these things early on because it means the adults don't have to go into great detail on the subject.
I wish we would drop Columbus day, the man was an idiot and an embarrassment. Most people durring his time believed the world was round, he believed the earth was pair (the fruit, can't spell) shaped.
Thanks for explaining the gravitation thing again, I know you said it before but I couldn't remember what was said.
The butterfly thing is an easy mistake to make though. They shed there skin and make a hard case out of their body which resembles the cocoon of a moth some what.
I'm rambling sorry. The system is changing and things come and go, but we are a race of story tellers. Many things are simply tribal knowledge. Like the Greeks and the urine of the red headed boy.
*now I remember what I was going to say. The partials that they believe to cause gravity haven't been discovered, or even proven yet. Its just as crazy to say that gravity pulls everything together as it is to say that the world is being propelled through space on a cloud of either.*