Many of these advances started with experiments and many times at the beginning they were not so successful, for example: the blood transfusions at the beginning were a great controversy. I also saw in a documentary that when anesthesia did not exist, many had to endure an amputation without it, the anesthesia was a bottle of alcohol and in surgery many thought with terror. Certainly, science has made progress in the quality of life of human beings, but it has also decreased, the advance in this field also the bacteria have become more resistant so that a new disease arises every time.