富人和你我不同——他们钱更多，同情心更少。

The essence of mathematics lies in its freedom.

The total amount of suffering per year in the natural world is beyond all decent contemplation. During the minute that it takes me to compose this sentence, thousands of animals are being eaten alive, many others are running for their lives, whimpering with fear, others are slowly being devoured from within by rasping parasites, thousands of all kinds are dying of starvation, thirst, and disease.

我不是传奇，我只是麦当娜。