The history of science has been one long series of violent brainstorms, as successive generations have come to terms with increasing levels of queerness in the universe.
Richard DawkinsSuppose that there's a gene that makes you gay if you were bottle-fed but that has some completely different effect if you were breast-fed. So in the days before bottles were invented that gene would not have manifested itself as gay behavior, but now that bottles are common it can do so.
Richard Dawkins