If he had a passport Charles Robert Darwin might have been described as a naturalist but he was one of the greatest of scientists, a titan among biologists. His theory of evolution by natural selection unified science, providing a coherent explanation for how the diversity of life came to be.
Richard Owen was a gifted biologist, comparative anatomist and palaeontologist. Today he is best known for coining the word ‘dinosaur’ but his contribution to science deserves much wider recognition.