What I'll remember from this post : it's not that because something already exists that you can't do it better. I once talked to one of my friend who had a grea

What I'll remember from this post : it's not that because something already exists that you can't do it better. I once talked to one of my friend who had a great idea but didn't even bother working on it. He just said "probably someone else is doing it" without even looking if it has been done or how. He keeps talking about leaving his job... since 2 years.