What does Natural Selection mean Why is there such a huge variety of living things on Earth This fascinating book looks at the history of evolution by telling the stories of the scientists who contributed to the various groundbreaking theories such as Charles Darwin Alfred Russel Wallace and Rosalind Franklin. It looks at the historical controversies that surrounded the various theories at the time how they were tested and what impact these theories and discoveries have had on the way in which we view the process of evolution today.