context: While writing his theory in 1858, Darwin received the manuscript of an essay sent to him by Alfred Russel Wallace, in which Wallace describes the theory he was developing. It seemed astonishingly similar to Darwin's theory. His 20 years of hard work were in danger of being wasted if the manuscript of Wallace's essay was published first. Darwin's scientific friends solved the problem of priority by having both Darwin's and Wallace's manuscripts on nature selection read at a meeting of the Linnean Society in London on July 1, 1858. Neither was personally present at the event. Darwin then hastened to publish his work, and his main work, The Origin of Species, was published in 1859. [7]
question: In what year did Charles Darwin publish his famous theory on the birth of species?
answers.text: 1859