A lot of things especially experiences. Two identical twins can start off the same but as their lives progress they will be individuals.
That we are all unique, no two people are exactly alike.
That we each bring a unique set of skills to any situation.
I don't really think that everyone is special. We are all different, but so are rocks. There are some people that are special, but I believe that comes from their inner essence. Everybody wants to be special, but in the end most of us are just plain old people living our lives as best we can. And that's ok too.