And that was my initial estimate as well until I doubted my own knowledge of how long history has been recorded. Apparently the definition for some stretches al

And that was my initial estimate as well until I doubted my own knowledge of how long history has been recorded. Apparently the definition for some stretches all the way back to 4000 BC! So to account for this wide range of opinions I anticipated I would encounter on HN, I chose to be vague.