On the Origin of SpeciesThe book that forever transformed how we view the diversity of life We have all heard of the theory of evolution. But how did it come about and what exactly does it mean? In December 1831, Charles Darwin embarked on an expedition to collect evidence from the Galapagos Islands and other locations, during which he speculated that species evolve over generations through a process he called natural selection. In 1859, Darwin published On the Origin of