It makes me shudder

... as Nat says, "it is genetically impossible for us to have children like KJ." Surely, environment played a factor to KJ becoming KJ today. I can't imagine anyone would be born to become like KJ or 老KJ. Or is it something that they eat? If only I knew all the exact elements that resulted in their behaviors today, I would then be able to prevent my children from becoming like them. And hence, I would be a happier person.