The fountain of content must spring up in the mind, and they who have so little knowledge of human nature as to seek happiness by changing anything but their own dispositions will waste their lives in fruitless efforts.

Every mental state is a function of some physical state of the brain.

Investing in cleaner coal technology is an investment in the future of energy.

一个奇怪的事实是，根据从生物学或地球物理学的角度出发，对地球史前条件会得出完全相反的结论，这反映了我们目前知识的不完整状态。

I think it's important to take risks and not be afraid of failure.

老兵不死，只是凋零。