5,000
I have no clue
That is unknown it is so far back in history.
Traces do not go back that far in history.
In 1892, John Froelich invented and built the first gasoline/petrol-powered tractor in Iowa. The history of the engines with in tractors go back as far as 1850.
Not as far as I know. The only way you may be able to see what pages you have previously visited on Facebook is through your browser history (e.g. Firefox, internet explorer, etc). But this depends on your History settings.
The history of human flight doesn't go very far back in time.
14000 ago
That is unknown because it is too far back in history.
Make that several thousand years!
Unknown. History doesn't record that far back.
I haven't seen a history text book in many years, so my information goes only as far as I can remember.