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History:- study of passed events , that may be recent Or longer or longest period. Division of historic periods:- 1.Pre history (25lakh to 3k BC) Note:- nothing is written. 2.Proto history(3k to 600 BC) Note:- written but couldn't read. 3.History(600 BC to.......) Note:- written and able to study. Note:- This division was done by John Bruse.