When do you think that the eraser was invented? Your first answer might be, if not simultaneously, then -certainly- soon after the invention of the pencil.
But, if that’s what you thought, you are wrong!
That eraser was invented 200 years after pencil was!
And the most interesting question that comes from this is how they erased theirs faults in writting without an eraser in the meantime?
Got anything to add?