In recent centuries, thanks to advancements in chemistry and laboratory techniques and equipment, feeding and hygiene improvements, the rate of mortality of various diseases has decreased considerably, thus increasing the life expectancy.
Many important discoveries in medicine have occurred by chance like that of Gregor Mendel (1822-1884) who published in 1865 his books on plants, from which they formed and spread to the laws of Mendel, which then form the basis classical genetics, this has enabled the discovery of DNA structure occurred in 1953. Another emblematic case was that of Alexander Fleming in 1928 saw, somewhat amazed, the disappearance of some colonies of Staphylococcus from a tube through the action of a small mold, testing, thus, the concept of antagonistic bacteria and antibiotic activity essential to eradicate infectious diseases.
Medicine, with its testing is often contrasts with the religion of the people and the religion they believe, and with both the ethical and moral principles of the individual. In 1930 several controversial medical practices were introduced including the ’shock and lobotomy, and in recent years, abortion and cloning are the subject of controversy.
