The one-sided science is that men are superior to women, and one man has multiple concubines... This is ancient times; men and women are equal, the science of relativity, monogamy... In conclusion, the divorce rate in ancient times was higher than in modern times, but there are more single-parent families in modern times. The rate of racial abnormality is higher than in ancient times... Of course, in ancient times, polygamy and multiple concubines were also caused by wars lingering in the long river of history...