Afghanistan is the land of my past, the place where I had laughed and cried, but it was no longer my home.

Simplicity is a great virtue but it requires hard work to achieve it and education to appreciate it. Simplicity is the ultimate sophistication.

The key to performance is elegance, not battalions of special cases.

科学并不试图解释，甚至几乎不试图诠释，它主要是构建模型。