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they usually used it for when others were sick,now we use it for when we are sick and when we got cold
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they used the metal compass to find their way through voyages
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the chinese invented the art of papermaking by the second century
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steel was very useful than metal
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paper was invented by the bulk from a mulberry tree
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porcelain is a chinease pottery and is made by feldspar and quartz
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accidentally discovered by alchemists who were looking for secret life
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rocket technology was powered by black powder made of saltpeter,charcoal and sulfur
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the mechanical clock was more accurate than an hour glass ond others
