"Begbie apparently does not understand that evolution/natural selection is like a blind worm, tormented by brambles (predators, illness) every time it makes a move. It naturally moves to better places, bit by tiny bit, without any planning. You don't have to be brilliant to make progress, given enough time. Evolution has millions of years to work with. Even with an I.Q. of 1, (the approximate computation power of the process of natural selection) you can still have impressive results."