I think the term "normal" is almost always a subjective term and different to everyone else; take the differences in musical taste for example - the only one that really seems "normal" to some people is the one that they like. But i guess the word "normal" could be a democraticly chosen definition of what's right, but then a lot of people say morality is just expression of emotion... so i guess NOTHING is normal, it's a made-up word that means nothing in the physical world like abstract ideas in physics like impulse and buoyancy force, they might seem to be apparent and real but logically they are just a human expression of a couple of different things put together.