The role of William Smith, Charles Darwin and Alfred Russell Wallace, Gregor Mendel, Francis Crick and James Watson in a comprehensive description of evolution. In 1794 William Smith may have been the first person to discover the fossil evidence for evolution. Sixty four years later Charles Darwin and Alfred Russell Wallace independently proposed the accepted explanation of how evolution works, and Gregor Mendel developed the rules of inheritance a short time later. Many other scientists completed the picture in the 20th century, with Francis Crick and James Watson being the most advertised. Now we know that life and digital computers are eerily similar. The central processing unit (CPU) controls a computer and DNA controls the process of life. Each uses a code to control simple operations that are repeated multiple times to generate complex actions. It all fits together to form the most important discovery in science. The fossil evidence, Darwin's and Wallace's theory, the way DNA controls the process of life, and Mendel's rules of inheritance all converge to form a complete description of evolution.