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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        
1859
 
     
Charles Darwin puts forward the theory of evolution in On the Origin of Species, the result of 20 years' research        
1919
 
    
H.L. Mencken's The American Language traces the gradual evolution of American from English       
1925
 
    
Biology teacher John Scopes is prosecuted for breaking state law by teaching evolution to his class of children in Dayton, Tennessee       
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   See in Google maps   
1959
 
    
Mary Leakey finds in the Olduvai Gorge the first specimen of a new hominid species, now known as Australopithecus Boisei       
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       
1974
 
Narrative history in HistoryWorld      
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        
1978
 
    
David Attenborough writes and presents Life on Earth, a television series on evolution – the first of his many surveys of natural history       
1994
 
Narrative history in HistoryWorld    
The fossilized skeleton of an Ardipithecus female, nicknamed Ardi and 4.4 million years old, is found in the Awash valley region of Ethiopia