In Chinese mythology, the farmer god took pity on humans who were suffering illnesses as a result of eating poisonous plants and drinking contaminated water. In an effort to help mankind, the farmer god tasted all the plants and taught humans the difference between those that were poisonous and those that were edible. He organised plants into four categories: bland, toxic, cool and hot, this system forming the basis of traditional Chinese medicine. The farmer god also taught mankind how to distinguish between types of soil and terrain. he created a wooden plough and taught man how to till the soil and sow grains. Research Farmer God
 
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