Scientists have been very successful in understanding and finding unifying principles. Many people take the resulting technology for granted and do not understand the limitations of humans as being part of the physical world. There are moral laws (or principles), civil laws, and physical laws. Moral laws have been broken, such as murder and adultery, and everybody has broken some civil law, such as driving over the speed limit. However, nobody breaks a physical law. Therefore, we can only work with nature, and we cannot do anything that violates the physical world. Another way of stating this: You cannot fool mother nature.