On Hygiene

聊聊卫生的概念。还有如何能在不伤害微生物环境下保证卫生

Let us talk about hygiene. In a sense. The relationship between hygiene and cleanness

Before the modern times. We tend to use hygiene to separate class differences. Now even the poor people are practicing basic hygiene. The rich invented more ways to show up “cleanliness “ as a symbol of status