How fast exactly is 1 Mach? Why do aircraft measure speed in Mach rather than kilometers?

China's largest security agency, more mysterious than the NSA and FBI, reveals China's real anti-esp

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Digital pickled vegetables: one is better than ten.

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Working 6,000s to Make the Fan Fly

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A printing press from the Sacramento History Museum

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Chemistry Buff’s Pick: Tin (Sn) — A Metal That Can “Honkai Impact” Itself!

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Facts have shown that charging in without being prepared leads to nothing…

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Do you know how glass marbles are made?

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The world’s seven top-tier bearing manufacturers, universally recognized!

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Men’s Speed Bump – Mechanical Series 1.23

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Wire is obviously very stiff, so why does it snap after just a few bends?

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Super cool mechanical series!

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Why is there always a worker crouching in the most dangerous spot next to the piling rig?

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Thousands of wires have been severed—how will the master reconnect them?

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Fully Automatic Mushroom Bagging Machine

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A one-minute video with four or five violations, including serious rule-breaking.

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The “man-speed bump” — capitalists weep, Jews kneel

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Another interesting tidbit about bearing installation has been added.

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[X-Plane 11] Air-to-Ground Communication & Two-Pilot Cockpit! Zibo737 Beijing Capital–Haikou Meilan

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0.28g ultra-light surfing Magnus effect aircraft

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Hot installation of a ZLYJ450 single-screw gearbox output shaft

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