7 Charles Darwin : Charles Darwin is one of the most contentious and greatest scientists in known history. He developed the theory of evolution, and provided evidence to back it up. His theory states that we are all descended from common ancestors, which resulted from the process of natural selection. He said that living beings are plastic to their environment, and have come to e the way we are through natural selection. Darwin encountered a lot of controversy because of his theory, and many people saw it as an attack on God. Eventually the scientific community, and the general public accepted it as fact, but there are still a large amount of people who don’t believe. Polls have shown that 40% of people in America believe in creationism.