Who mixed Bark, old rags and fishing nets together?, Cai lun, Johannes Gutenberg, Leonardo Da vinchi, Who invented the first piece of paper?, Cai lun, Johannes Gutenberg, Leonardo Da vinchi, Who can print thousands of pages in no times?, Johannes Gutenberg, Leonardo Da vinchi, Thomas Edison, Who made the first printing press?, Johannes Gutenberg, Leonardo Da vinchi, Cai lun, Who was curious about everything?, Leonardo Da vinchi, Cai lun, Thomas Edison, Who drew plans for machines?, Leonardo Da vinchi, Cai lun, Thomas Edison, Who is the most famous artist in the world?, Leonardo Da vinchi, Cai lun, Thomas Edison, Who was always reading and asking question?, Thomas Edison, Johannes Gutenberg, Leonardo Da vinchi, Who invented light bulb?, Thomas Edison, Johannes Gutenberg, Leonardo Da vinchi

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