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16 " Darwin singled out the eye as posing a particularly challenging problem: 'To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest degree.' Creationists gleefully quote this sentence again and again. Needless to say, they never quote what follows. Darwin's fulsomely free confession turned out to be a rhetorical device. He was drawing his opponents towards him so that his punch, when it came, struck the harder. The punch, of course, was Darwin's effortless explanation of exactly how the eye evolved by gradual degrees. Darwin may not have used the phrase 'irreducible complexity', or 'the smooth gradient up Mount Improbable', but he clearly understood the principle of both. 'What is the use of half an eye?' and 'What is the use of half a wing?' are both instances of the argument from 'irreducible complexity'. A functioning unit is said to be irreducibly complex if the removal of one of its parts causes the whole to cease functioning. This has been assumed to be self-evident for both eyes and wings. But as soon as we give these assumptions a moment's thought, we immediately see the fallacy. A cataract patient with the lens of her eye surgically removed can't see clear images without glasses, but can see enough not to bump into a tree or fall over a cliff. Half a wing is indeed not as good as a whole wing, but it is certainly better than no wing at all. Half a wing could save your life by easing your fall from a tree of a certain height. And 51 per cent of a wing could save you if you fall from a slightly taller tree. Whatever fraction of a wing you have, there is a fall from which it will save your life where a slightly smaller winglet would not. The thought experiment of trees of different height, from which one might fall, is just one way to see, in theory, that there must be a smooth gradient of advantage all the way from 1 per cent of a wing to 100 per cent. The forests are replete with gliding or parachuting animals illustrating, in practice, every step of the way up that particular slope of Mount Improbable. By analogy with the trees of different height, it is easy to imagine situations in which half an eye would save the life of an animal where 49 per cent of an eye would not. Smooth gradients are provided by variations in lighting conditions, variations in the distance at which you catch sight of your prey—or your predators. And, as with wings and flight surfaces, plausible intermediates are not only easy to imagine: they are abundant all around the animal kingdom. A flatworm has an eye that, by any sensible measure, is less than half a human eye. Nautilus (and perhaps its extinct ammonite cousins who dominated Paleozoic and Mesozoic seas) has an eye that is intermediate in quality between flatworm and human. Unlike the flatworm eye, which can detect light and shade but see no image, the Nautilus 'pinhole camera' eye makes a real image; but it is a blurred and dim image compared to ours. It would be spurious precision to put numbers on the improvement, but nobody could sanely deny that these invertebrate eyes, and many others, are all better than no eye at all, and all lie on a continuous and shallow slope up Mount Improbable, with our eyes near a peak—not the highest peak but a high one. "

Richard Dawkins , The God Delusion

18 " Men may perish, but the world will neither celebrate nor mourn. It will go on.' His smile thinned. 'Would you like to know how?''No.''Animals will swell to fill the void left by men," he told her. 'And over-swell it, perhaps. There will be other extinctions and other recoveries. The sky will clear, but those who see it will not marvel at its many colors. Those ruins will collapse, burying treasures like this-' He waved at the walls. '-and this-' He picked up the spoon from her coffee tray and tossed it down again with a clatter. '-forever, but the world will go on. Years become centuries so easily when no one is there to count them. Centuries become millennia. The forests will reclaim the lands that Men have razed. Rivers will carve canyons across the scars left by this fallen cities. Mountains will rise up, trapping seas to dry under and uncaring sun and leaving the bones of whales to bleach in the newborn deserts for no one to find, no one to be inspired by thoughts of giants and dragons. And still the worlds will go on, and I will go on with it through ages that can only be measured by the coming and going of glaciers. The stars themselves will shift in the heavens and no one will be there to invent names for their new alignments or remember the stories of the old ones, no one but me. In time, the sun itself will begin to cool. Here on Earth, the world goes on and on as its remaining life passes through its last changes and dies away. It will be quiet. And lonely.' His mouth curved into a bitter line. 'But I'll live.''Stop it,' Lan whispered through numb lips.'I read once that the sun will someday swell and engulf this world before it burns itself out. Perhaps I will finally die with it. Or perhaps I' will continue to endure... my ashes pulled eternally apart through the frozen vacuum of space, and I with no more mouth to scream... still alive. "

20 " Contemporary writers use animal-transformation themes to explore issues of gender, sexuality, race, culture, and the process of transformation...just as storytellers have done, all over the world, for many centuries past. One distinct change marks modern retellings, however, reflecting our changed relationship to animals and nature. In a society in which most of us will never encounter true danger in the woods, the big white bear who comes knocking at the door [in fairy tales] is not such a frightening prospective husband now; instead, he's exotic, almost appealing.Whereas once wilderness was threatening to civilization, now it's been tamed and cultivated; the dangers of the animal world have a nostalgic quality, removed as they are from our daily existence. This removal gives " the wild" a different kind of power; it's something we long for rather than fear. The shape-shifter, the were-creature, the stag-headed god from the heart of the woods--they come from a place we'd almost forgotten: the untracked forests of the past; the primeval forests of the mythic imagination; the forests of our childhood fantasies: untouched, unspoiled, limitless.Likewise, tales of Animal Brides and Bridegrooms are steeped in an ancient magic and yet powerfully relevant to our lives today. They remind us of the wild within us...and also within our lovers and spouses, the part of them we can never quite know. They represent the Others who live beside us--cat and mouse and coyote and owl--and the Others who live only in the dreams and nightmares of our imaginations. For thousands of years, their tales have emerged from the place where we draw the boundary lines between animals and human beings, the natural world and civilization, women and men, magic and illusion, fiction and the lives we live. "