Students and children who do not have a place to go to the electronic toilets made by foolish guys will be gathered. We are socially vulnerable, but are wealthy in a big way. Accumulation of stool generates a strong odor. The same is true for virtual places. Offensive odor limits brain function and we strive to be more stupid. This is not the only sad world. Perhaps this is a global problem. Many people may have lost their parents, siblings or friends.