And in November, a century and a half after On the Origin of Species was published, we commemorate the beginnings of the theory by which we all know him.

而到今年的十一月，我们将迎来《物种起源》出版一百五十周年，届时我们将纪念他的理论的面世，正是通过这一理论我们知道了这个人。

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The book was “On the Origin of Species”. And the challenge was the theory of evolution by natural selection.

这个人就是查理斯•罗伯特•达尔文，这本书叫做《物种起源》，而发起的挑战则是基于自然选择说的进化论。

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English natural scientist whose 'On the Origin of Species' formulated a theory of evolution by natural selection (1809-1882).

英国博物学家（1809-1882），他的《生物起源论》阐明了自然选择的进化论学说。

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Darwin had been working on his theory for over twenty years when he published " On the Origin of Species."

VOA: special.2009.12.01

He landed, camped there, left and returned, studied, researched and conceived his earth-shaking theory of evolution, On the Origin of Species, in 1859.

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These findings would not have surprised Charles Darwin, who in addition to theorizing on evolution in The Origin of the Species, also developed the Facial Feedback Response Theory, which suggests that the act of smiling actually makes us feel better (rather than smiling being merely a result of feeling good).

FORBES: The Untapped Power Of Smiling