Normal people will have diarrhea if they eat bad food, right? This should be well-known common sense, and it has often been recognized that ordinary people do not think about this issue at all, because it is instinct! But what about investing? Very different! Whether you can distinguish the direction is not instinct, but ability + luck, which is the main premise. But many people only stop at analyzing the impact of good food on people. However, shouldn't we judge whether the food is good or bad before eating?