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Darwin gathered up the courage to publish ''On the Origin of Species'' primarily because a naturalist named Alfred Russel Wallace sent him a copy of a manuscript that expounded a mechanism of evolution that was oddly similar to Darwin’s own. It seemed that the two men had independently come to a very similar conclusion – that the primary evolutionary mechanism was the “survival of the fittest”, as it would later come to be known. Darwin and Wallace decided to present their work to the Linnean Society (a sort of gentlemen’s club of natural history) together in July of 1858, but their joint lecture drew little attention. Darwin would finally publish ''Origin'' the next year, in 1859. The book was immensely popular – drawing both high praise and brutal censure – but the scientific world would never be the same.

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