The incredible "curved and straight" model, the rotating and tilted red straight rod, an interesting

How does the Dujiangyan Irrigation System work? How did this 2,300-year-old water conservancy projec

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Mathematical Genius

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192 Years Old! The Longest-Living Tortoise in History Has Seen at Least Four Generations Come and Go

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Bleeding Heart

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50 Shades of Compromise

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What is a semiconductor? What are semiconductors used for? A 3-minute guide to understanding semicon

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What is "Metal Drawing"? Put the iron sheet on the machine and press it hard, and an interesting phe

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Mercury, the natural nemesis of gold, when mercury is dropped onto gold foil, an interesting phenome

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What is an "oxygen candle"? Do you know how burning can actually produce oxygen?

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Weird "concave face illusion": why does the pit we hit look convex?

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Incredible "Ball Clock"! Use a small ball to tell time. Do you know the principle?

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What is scraping? Precision machine tool processing must be done manually, this is the real technolo

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What are "heat pipes"? Why are there metal rods on both sides of the Qinghai-Tibet Railway?

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Incredible "cotton ice cubes" are as strong as reinforced concrete! Can they be used to build aircra

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The incredible "cylinder illusion" - put a cylinder in front of a mirror and an interesting phenomen

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What is a Tesla coil? Put a small flower on it and a strange phenomenon will happen.

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How did the ancients get change when they bought something with silver? I didn't expect the method t

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Incredible supercooled water freezes immediately when poured into the air. Do you know the principle

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The most rebellious bridge, the "suspension belt bridge," has stood suspended for 30 years—do you kn

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What is Ice 18? Can you imagine that water can freeze at a high temperature of 2000℃?

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