In 1854, Alfred Russel Wallace began an eight year collecting trip to Southeast Asia, through the region he called the Malay Archipelago (now Malaysia, Singapore, Indonesia, and East Timor). It was during this expedition, in the midst of a fever in 1858, that Wallace conceived (independently of Darwin) of the theory of natural selection. Wallace expanded his idea into a detailed article which he sent to Charles Darwin for comment, unaware that Darwin himself had come to the same conclusion, though he had yet to publish the theory.
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