Order is the key word of science. Scientists have tried to order and explain all the phenomena of the universe. They found that the planets and stars move along predictable paths, discovered the laws of gravitation and devised formulae to describe inheritance. For them, the universe is like a clock. Their mission is to discover and explain the mechanism of this clock and thus explain the laws that guide all natural phenomena. Faith in the ability of science to explain the world surrounding us gave rise in the 19th century to the movement of Positivism, which was based on the belief that science could ultimately solve all of humankind’s problems and which influenced social theories. Positivism is now outdated, but ‘scientistic’ mentality still shapes the thinking and actions of many people, particularly in the Western world. Expressions such as ‘scientifically demonstrated’ or ‘there is no scientific evidence’ are often used as irrefutable arguments.