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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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How does a Ball Point Pen Work | How Stuff Works | How Devices Work in 3D | Science For Kids - YouTube
How do ballpoint pens work
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People are only just realising how a ballpoint pen works - and claim 'life is a lie' - Mirror Online
Extreme closeup video shows how a ballpoint pen works, in all its gory detail
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Incredible close up video shows how a ballpoint pen works | The Fat Cat Collective
