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How a Bic ballpoint pen works · XDL

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How a Bic ballpoint pen works

How a Bic ballpoint pen works

@Massimo

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Impressive paper airplane with folding instructions

Building a cube with magnetic balls.

This is how to open a number lock using nothing but a piece of paper.

The amazing mechanics of how bee stingers work [🎞️ Jon Perry / StatedClearly]

How a nuclear bomb works

A bacterial flagellum is driven by a rotary engine made up of protein, and is powered by the flow of protons across the bacterial cell membrane. It rotates at ~1,000 rpm, but the rotor alone can rotate at up to 17,000 rpm. [📹 smart-biology]

How a nuclear bomb works

How to fold a paper airplane that loops back to you — fun for kids to play with.

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