In another example, the author claims that human life span should be 125 years. His reasoning is that "The growth period in the human brain lasts 25 years. Life expectancy is normally five times the maturation period of the brain. Thus, 25 times 5 is 125 years."
此外，作者認定人類的壽命應可達到一百二十五歲，其理由是：「人類的腦大致成長到二十五歲為止，腦部成長期間的五倍就是壽命，因此二十五乘以五就是一百二十五歲。」