The molecular paleontologists says that it is a characteristic of mankind to "be able to work together." There were more than 20 kinds of human beings including the Neanderthal people, but only we, Homo sapiens survived. Helping one another with childcare has enabled us to have more children. We have dealt with harsh environments by highly developing the mutually cooperating life of using languages, distributing food and producing goods. From "Human History Of Extinction."
June 21, 2018
from “Oriori no Kotoba” by Kiyokazu Washida, The Asahi Shimbun