From the standpoint of your genes, you dying for the life of three brothers is an excellent compromise 50% because the genes replicate by fifty percent more.

从你自身基因的角度看，你为了三个兄弟牺牲自己,是非常好的折中,因为基因复制超过。

耶鲁公开课 - 心理学导论课程节选