Two needles can make a Stirling engine, so let's try it soon.

Isn't this a perpetual motion machine?

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It feels okay to play with a paper cup as an aircraft.

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[Life] Handcraft: A Brass Umbrella Transformable to 15 Weapons

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The UCI’s jurisdiction is really broad—even the support staff are involved!

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Today is another very "punishment" day, da da da

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Handcraft | How Does A Flick Daggar Work

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physical magic

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How to make a lighter that works "forever"

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The easiest and fastest way to make a silk launcher

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Four door lock mechanisms, three linkages, two linkage locks, worth collecting

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