And although I have seen nothing but black crows in my life, it doesn't mean that there's no such thing as a white crow. Both for a philosopher and for a scientist it can be important not to reject the possibility of finding a white crow. You might almost say that hunting for 'the white crow' is science's principal task.
Jostein GaarderThe rearing of children is considered too important to be left to the individual and should be the responsibility of the state.
Jostein Gaarder