Going back to metaphysics, we find that has logical consistency, accuracy and a verification token that is limited to rational criticism. Therefore, using this criterion of demarcation, metaphysics is a science. In the field of experimental sciences, is heavily influenced by the scientific method. But using it does not allow us to investigate what is science. By using this method can be committed certain attitudes that lead to hasty unsafe knowledge, perhaps pseudo-scientific.
An example: the formula Drake2 Frank, founder of SETI3, which gives us the number of existing technological civilizations that may make interstellar communication: N = R *. fp.na.fv.fi.fc.D If we follow the line of thought of the Vienna Circle would need to verify this formula in order to be scientific. This is the attitude that perhaps takes the SETI project: parabolic listening oriented toward the sky if you receive any signal that appears to have a logical structure developed by an intelligent civilization. Therefore, would be compromised during the time that it took to complete a contact. But if there were, we would find ourselves completely scientific formula (if you have also correctly predicted the total number of civilizations.) Popper not considered scientific because it is not falsifiable: it would take to track all the universe and see that no other civilization, once done, would be denied, but it is impossible to make such interstellar travel. Finally, we look at the demarcation criterion described above. On the one hand, it is difficult to determine the degree of consistency or internal logic that has this formula.