What’s the working principle of a music box? It plays automatically after a few turns—how overlooked

The secret of the square wheel's forward motion: the catenary, which mathematicians have studied for

lengkepu

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Those irresistible mechanical charms~

jixiepangke

28 Views

10pm in the eyes of primary school students vs 10pm in the eyes of middle school students vs 10pm in

juanbatushu

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Irresistible mechanical charm~

jixiepangke

128 Views

Speed bumps: the amazing work of skilled workers at work~

jixiepangke

80 Views

Decompression video of the workers series!

jixiepangke

31 Views

Skilled workers are working at a satisfactory site~

jixiepangke

41 Views

This technology is simply~

jiajudarenmrwen

29 Views

Men's Speed Bump: A Satisfactory Work Site

jixiepangke

152 Views

#白鹿#'s eyes are really warm and she keeps looking at #周深##宋玉琪##跑吧#

dianyingdamanguanvb

42 Views

Uranus = Neptune? [Celestial sphere of the solar system]

taiyangxidetiantiqiu

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Why can the boomerang fly back

123zhifeijiV

364 Views

My family, we just say that this transformation is so handsome to me.

tahnoatc__01

1.8K Views

Will a beaver be crushed to death by a tree it gnaws down?

tinglu

18 Views

【Wednesday Animation】Let me tell you the correct way to charge!

GHSdonghua

61 Views

Spoon/fork: If I had known this was a bad factory

xiaokechibaobao

40 Views

【Wednesday Animation】Wednesday is the best friend!

GHSdonghua

140 Views

A satisfying work site at the speed bump of humanity~

jixiepangke

51 Views

A group of bees sit in a "classroom" to study. Is that so cool? In fact, they are trained little ins

YouTubejingcaishipin-

9 Views

It starts with a fallen leaf and ends with a fallen leaf

molubili

32 Views