介导疼痛的分子非常古老，揭示了这种感觉在进化中的深远根源。

在每个故事中，都有一个隐藏的真相，等待着读者去发现。

The dead are the most persistent historians.

No man really knows about other human beings. The best he can do is to suppose that they are like himself.

思想的任务不是再现现实，而是回应存在的召唤。