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A ballpoint pen. How does it work? In the tip of the pen there is a small metal sphere. One internal tube filled with a viscous ink is above the ball. -
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/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/2012082202400708_22_2012_ballpoint-pen.jpg "The Story of László Bíró, the Man Who Invented the Ballpoint Pen | Smart News| Smithsonian Magazine")
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