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Chinese alchemists looking for the secret to eternal life accidentally discovered gunpowder.
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printers were used to make cards from thick paper. Artists painted designs on the cards. Cards games are still played worldwide today.
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the new mechanical clock was more accurate than sundials and hourglasses. The wheel dripped water made the wheel turn. Sounds likes drums and chimes let people know what time it was.
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they figured out that the stone, lodestone, was influenced by the magnetic field. Later they used a more accurate steel needle.
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This very useful metal was made first by the Chinese. They were made from cast iron, made by melting and molding iron ore. By chemical reaction, they found out how to make a metal stronger than iron.
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China improved their ships by making several compartments. That was much more stable and reduced the ability to sink.
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Porcelain was a type of pottery. It was made of clay made of quartz and feldspar, baked at very high temperatures. They were beautifully made and were a prized trade item.
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To fight off disease when someone was sick, the Chinese burned chemicals that they thought would fight it off. They used disinfectant, and hot temperatures to fight off disease, like we still do today.
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Unlike Roman bridges, these bridges used a half circle. This bridge was easier to make, and was stronger. They were broader and flatter than before.
