On the Origin of Species

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Referenced when discussing Darwin's theory of evolution and noting that he was too nervous to include his theory about human evolution in this earlier work

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Referenced in discussion of how Sade prefigured Darwinist ideas about survival of the fittest

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Referenced as Darwin's major work where the Galapagos finches feature as evidence for his theory of evolution by natural selection

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Gordon mentions that Darwin 'spends quite a bit of time in origin and species talking about pigeons' in relation to selective breeding and drawing analogies between artificial and natural selection.

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Referenced in discussion about the timing of the Neanderthal discovery, noting it was announced around the same year (1859) as Darwin's famous work was published.

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Referenced during a discussion about how species are defined and classified. Jack Horner mentions this book when explaining how scientific thinking changed regarding the classification of organisms and the concept that species evolve over time rather than being completely distinct from one another. The speaker incorrectly dates it to 1959 (actually published in 1859).