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Steel is a strong metal that is used for many things. They casted the metal with iron and when the iron is casted in creates a chemical reaction, creating steel.
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Back then paper used to keep documents remembered, as it is today, too.We wouldn't have any knowledge on Chinese history.
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When tea first was drunken by all of China in the 8th century. But it has been drank before, only for medicine though.
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Paper was used as another form of currency. Money was made the same as a card, just not thick paper.
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There was a wheel that made a rotation every 24 hours forced by dripping water.
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Game cards were used the same today as they were back then. They were just made with thick paper.
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This was made by accident, while trying to make a substance to make someone immortal. This used for guns and explosives.
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This was used to burn enemies. This is important because it was China's first weapon.
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At first rockets were used only for fireworks. Then, they started using them as weapons. Without the creation of the rocket we wouldn't have someone on the moon.