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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       
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      
2003
 
     
Michael Rogers, in a team led by Sileshi Semaw, discovers the world's oldest known chipped stone tool, at Gona in Ethiopia