Bats usually fly at night. Some ancient Chinese thought that they must have good eyesight. They then thought bats' body parts might be good for human sight. Another big logic jump of these ancient people is they then decide to use dried shit of bats as an ingredient of Chinese medicine. This can be named a triple jump of Chinese medicine logic.
This shit have also a fancy Chinese name, in English, sands of night lights （夜明砂）.
CM doctors are very proud of this great finding. They are still using these `sands' in many Chinese medicine.
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