With sufficient global natural disaster this could probably happen.
However, to make the goal trickier, for this challenge humanity must continue to exist and the overall tech level cannot go below that of about 500 BC.
Printing press technology can (but does not have to) come back by 21st as long as it was lost for over 2 centuries.
However, to make the goal trickier, for this challenge humanity must continue to exist and the overall tech level cannot go below that of about 500 BC.
Printing press technology can (but does not have to) come back by 21st as long as it was lost for over 2 centuries.