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c. 4000 BC
 
Narrative history in HistoryWorld    
A simple hand-held plough is in use in Egypt and Mesopotamia, at least 1000 years before a heavier version is pulled by oxen      
3100 BC
 
  
The invention of writing marks the transition, in academic terms, from prehistory to history     
c. 3000 BC
 
Narrative history in HistoryWorld    
The lever is in use in both Mesopotamia and Egypt