Do you think it's humans' nature to take good care of ourselves first ? Not exactly.some are not. For examples,Madame Curie and Premier Zhou Enlai. It can be changed too. Parents put children at the first place and in some hard situations like in a war ,when earthquake happens, people will sacrifice themselves for the others.Not exactly.some are not. For examples,Madame Curie and Premier Zhou Enlai. It can be changed too. Parents put children at the first place and in some hard situations like in a war ,when earthquake happens, people will sacrifice themselves for the others.