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| 1858 |
| | Charles Darwin is alarmed to receive in his morning post a paper by Alfred Russell Wallace, outlining very much his own theory of evolution | |
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| 1859 |
| | Charles Darwin puts forward the theory of evolution in On the Origin of Species, the result of 20 years' research | |
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| 1919 |
| | H.L. Mencken's The American Language traces the gradual evolution of American from English | |
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| 1925 |
| | Biology teacher John Scopes is prosecuted for breaking state law by teaching evolution to his class of children in Dayton, Tennessee | |
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| 1931 |
| | On his first expedition to the Olduvai Gorge, Louis Leakey finds the oldest object now in the British Museum - the chopping tool from about 1.8 million years ago | |
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| 1959 |
| | Mary Leakey finds in the Olduvai Gorge the first specimen of a new hominid species, now known as Australopithecus Boisei | |
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| 1968 |
| | Peter Nzube finds the oldest skull yet discovered in the Olduvai Gorge and names the specimen Twiggy, after the British fashion model of the time | |
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| 1974 |
| | Donald Johanson and Tom Gray find an almost complete Australopithecus female skeleton at Hadar in Ethiopia, and nickname her Lucy after the Beatles song Lucy in the Sky with Diamonds | |
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| 1978 |
| | David Attenborough writes and presents Life on Earth, a television series on evolution – the first of his many surveys of natural history | |
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| 1994 |
| | The fossilized skeleton of an Ardipithecus female, nicknamed Ardi and 4.4 million years old, is found in the Awash valley region of Ethiopia | |
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