What is the 21-centimeter line? What are the fine structure and hyperfine structure of atoms?

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The teasing has begun!

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Damn, Am I Seeing Sound Now?

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High Voltage Toys 9

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[DIY] I will teach you to make cool bismuth crystal!

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They say diamonds are forever, but they can be burned and broken.

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The power of science

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Yemen is the first country to be destroyed by drugs, even children are not spared. How tragic is it?

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Far more than the average family car? A palm-sized inline four! The whole process of assembly!

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Why is steel colored after cutting? #Science #Unzip #Metalworking #CoolKnowledge

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Let's take a look at the amazing workplace of skilled workers!

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How to lay a qualified asphalt road? #Science #Unzip #Paving #Knowledge

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Speed bumps!! A mechanical marvel men can't resist~

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How to draw a circle?

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Two mods to make your Minecraft more realistic

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[Painting]Painting Tutorial: Human body structure

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Relaxing video: Skilled workers at a satisfying job site~

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Help me see, is this a mortise and tenon structure?

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A few useful life hacks~

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