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PAC學習框架提供了一種形式化的方法來量化概念類的可學習性。

"The only true voyage of discovery, the only fountain of Eternal Youth, would be not to visit strange lands but to possess other eyes, to behold the universe through the eyes of another, of a hundred others, to behold the hundred universes that each of them beholds."

The most dangerous phrase in the language is, 'We've always done it this way.'

科學應該為人類服務，而不是反過來。

"I am not interested in the surface of things, but in what lies beneath."

當我們想到過去時，我們挑選的是美好的事物。我們想相信一切都是那樣的。