One of Leonardo da Vinci's genius inventions: the miter lock! It's been used for 500 years. How does

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lengkepu

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The incredible "Paternoster Elevator" has no doors and never stops. Do you know how it works?

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This is the first time I've seen this kind of lighter! Slide the metal clip to the right and somethi

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I hope everyone knows this first aid knowledge!

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An interesting old item called "candle extinguisher" can extinguish candles at a designated location

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What is the purpose of the "little house" you see during an eye exam? Why is it sometimes clear and

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The incredible "pinhole camera" takes 1,000 years to expose! What does the photo look like?

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