• Five per cent vision is better than no vision at all. Five per cent hearing is better than no hearing at all. Five per cent flight efficiency is better than no flight at all. It is thoroughly believable that every organ or apparatus that we actually see is the product of a smooth trajectory through animal space, a trajectory in which every intermediate stage assisted survival and reproduction.

    Richard Dawkins (2015). “The Blind Watchmaker: Why the Evidence of Evolution Reveals a Universe without Design”, p.96, W. W. Norton & Company