The sun is the centre of the universe.
Last year when we were studying an astronomy unit in science, they said the sun was the centre of the universe. It may be the centre of the universe, and let's focus on that. Have we discovered all of the universe? No, then the case is settled.
I had a nice time standing up and explaining why it wasn't so everytime a girl or the teacher said so. Just because there are 11 or 12 or something planets that go around the son, doesn't have to mean that it is the centre of the universe.
And they also teach us that the sun the is the number one source of energy in the universe, we all know that the sun isn't the biggest star in the universe, so they just need to stop generlizing things.
Your family should help you choose your friends.
I understand that we need our family's approval in certain things and that if they didn't think our friends worthy we should give their opinion consideratin. But let's think of it this way: Do you know you'll become friends with this certain person or that you will have a nice friendship with him/her before hand? No, you don't. So that means friends just happen, I mean yes they happen because of a certain situation maybe or that you feel connected or whatever but it doesn't involve planning it. At least in most cases.
That means your friends can't really help you choose your friends, they can help you with deciding whether to keep this friendship or end it. So when they teach us that our family should help us choose our friends they make us feel that our families should dominate our lives.
That's what I had in mind to crtisize, I may get more things school teaches us that is wrong but this will do for now. :)