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POPS25 Greatest Science Books of All Time The Origin of Species (1859) Darwin's masterwork is, undeniably, The Origin of Species , in which he introduced his theory of evolution by natural selection. Prior to its publication, the prevailing view was that each species had existed in its current form since the moment of divine creation and that humans were a privileged form of life, above and apart from nature. Darwin's theory knocked us from that pedestal. Wary of a religious backlash, he kept his ideas secret for almost two decades while bolstering them with additional observations and experiments. The result is an avalanche of detail—there seems to be no species he did not contemplate—thankfully delivered in accessible, conversational prose. A century and a half later, Darwin's paean to evolution still begs to be heard: "There is grandeur in this view of life," he wrote, that "from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved."