Many people think that science is based upon the knowledge of facts proved by reason and logic, and very few know that at the beginning there was always intuition. All scientific discoveries spring from intuition; after that reason has its place, and logic helps. The scientists analyze and make their discoveries intelligible to others, but in the beginning these come from intuition. If the great inventors of America such as Edison and others had been great mechanics only it would not have been sufficient; behind this, however, there was intuition.