Four greatest invention in Ancient China ep2/4: :Gun powder

Gun powder was invented during he Sui and Tang dynasties (AD 581 - 907). It was started off during the alchemy of immortality medicine process. So gun powder was invented unintentionally. 

Surly the creation of immortality medicine failed. However gun powder was used as medicine. As Běn cǎo gāng mù ( the bible of Chinese medicine) stated, it can heal skin ulcers, cue plaque, use as insecticide. 

Later on the gun powder techniques transferred to the military development, and hence became one of the four greatest invention in China. 

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Four greatest invention in Ancient China ep1/4: Compass

Compass was first found being used during the Spring and Autumn Warrior  Kingdoms era (BC 475 - 221). It was made by natural magnet and was designed similar as a spoon with a rounded bottom so that it can be placed on a smooth platform. It was called "South setting" as it points to the South direction. Once it was invented, it was widely used for military function.

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