Intellectually Curious

Ballpoint Pen Micro-Engineering

Mike Breault

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0:00 | 5:19

A deep dive into the everyday wonder of a cheap, disposable pen. From tungsten carbide bearings and textured sockets to capillary ink action and shear-thinning fluids, we unpack how nano-sized tolerances and surface roughness unlock smooth, reliable writing. Debunk the myth of a perfect 500-nm gap, explore how a gel ink becomes liquid under pressure, and reveal the extraordinary science behind a tool you probably use daily.


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