How do we know about the past?

Mainly the archaeologists or the historians are the people who make an attempt to find out about our past as much as they can. The historians frequently refer to various sources of history. These sources can be clay tablets, grave inscriptions, or simple letters. Sometimes they have to decode the script, such as the hieroglyphs, which was discovered in the Egyptian pyramids. Archaeologists, on the other hand, dig places where they can find evidence of past human activity such as bones from the stone age or remains of buildings or vessels that fell down in wells.The ancient cave paintings have proved

Ancient cave paintings 

to be a strong clue in knowing the history.