IN my opinion the greatest invention is the printing press I think the printing press is so important because when it was invented we had a lot of books,around the world Before the printing press was invented they had to copy everything by hand.And carved woodblocks,And after the printing press was invented people start using it to write and copy,[photocopy] books easily after life was so much easier,Therefore,I firmly believe that the printing press is the greatest invention of all time because with it typing,photocopy is way more easier
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