In his day, his words sparked excitement in some and fury in many. No matter what side of the fence you stand on regarding Charles Darwin and his ultimate work, The Origin of Species, there is no denying his impact on society and the scientific community. This month, in celebration of Darwin's birth 200 years ago, check out over a dozen titles on the English naturalist whose groundbreaking theory of natural selection profoundly influenced the way we look at ourselves and the world around us.