The relationship between the number of times the ball hits the circle and pi.

Showcasing Several Rare Mathematical Problems

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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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Why do we need to cut a slant on the tree when felling it?

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Why do two people need to swing the hammer when forging iron? #Science #Unzip #Ironmaking #Forging #

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Car Disassembly Video

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

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I used 21 functions to draw Luo Xiaohei!

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Why are the joints of steel cables so strong? #Science #Unzip #SteelCable #MachineryManufacturing #E

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What's it like to have a face that looks like a kid's?

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

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DIY Process | DIY Tricks You Could Use

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How to draw a circle?

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To win the emperor's favor, Empress Dowager Cixi learned flirting techniques from a famous courtesan

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[Movie&TV] Movies that Can Make You Love Maths

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Why doesn't it hurt when a needle is stuck in my finger?

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Christmas with math - Robin Gan

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I was so excited to have a big meal on my first flight!

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Introduction to Tequila

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