The discovery that the narrator makes by dissecting his brain is learning that his thoughts require a constant flow of pressurized air because brain activity slows due to low air pressure.
I feel like kindness can be taught because if someone is mean and you set a good example and they want to be just like you they will start be kind. You can also teach kindness in a classroom by making everyone be nice to have a happy classroom and people will be asking for help and asking to borrow something. I also feel like it matter on the age.
Many people have been killed their and crossing the path is a reminder of that.
