The pre historic era begin in about 3500 BC and the system of writing on earth begins at this time. The innovations were printing press, compass, paper currency, steel, domestication of horse, transistors, magnifying lenses, the telegraph and antibiotics etc. two types are homo sapiens neanderthalensis and homo sapiens Cro-Magnonensis. they have DNA like modern humans. epic mean the past history of a nation in the world. and they tells us about the heroic life of the nation their history and culture.