All known surviving pages of the rough draft of Charles Darwin’s On the Origin of Species have been published online by the National University of Singapore (NUS). On the 164th anniversary of its publication, NUS published three recently rediscovered pages from Darwin’s draft. The draft pages make it possible to see in detail how Darwin originally composed and revised many of his arguments and expressions. The drafts also contain many sentences that didn’t make the final cut, offering fascinating insights into Darwin’s thinking as he composed the book that quite literally changed the world.