To Genna:
This misconception of science you show is seen everywhere, makes me go crazy, like if we where in 1700.
Here you go, I hate to do research for others, specially when they aren't going to read. But here is it for everybody who is interested:
In the early years of science, the system of acquiring knowledge was viewed as completely objective, rational, and empirical.[6] This traditional view of science held that scientific theories and laws were to be conclusively confirmed or conclusively falsified based on objective data. This was supposed to be done through the scientific method. Apparently some sort of method was necessary because humans seemed to have a variety of tendencies and feelings that were not very trustworthy, including biases, feelings, intuitions, and so forth. These kinds of things had to be prevented from infecting science so that knowledge could be reliably obtained.[7] Rigorous and precise procedure (the scientific method) was to be followed so that such imperfections of humanity would not hinder the process of discovering nature.
Unfortunately, hypothetico-deductivism also has problems. The philosophy that rigorous proof is necessary for good science has serious problems even if we assume that sense experience, memory, and testimony are all generally reliable.[13] For one thing, we cannot be sure that we have examined all the germane data.[14] There is always the opportunity for future observations to topple even the most established of theories.[15] For example, there is always the possibility that an observation could conflict with any known scientific law. This is what caused Newtonian mechanics to be cut down to size. Rather than being a total account for the nature and dynamics of the universe, Einstein, Heisenberg, and other physicists demonstrated that the realm of Newtonian mechanics is much more restricted than what was once thought. Unrevealed data can also contradict the predictions of any explanatory theory as well. Every theory has an infinite number of expected empirical outcomes, and we are incapable of testing all of those expectations. So even though a theory can be confirmed to some extent by empirical data, it can never be conclusively confirmed.
So it does seem that, if the only way to evaluate theories is in terms of empirical predictions, science is in trouble. In testing theories, scientists use auxiliary assumptions for which they have rational reason for being true, even though the assumptions and theories are not conclusively proven. Yet, given the underdetermination of theories, we cant just pick a theory and justify it solely by the data. We cant even justify a particular theory as probable by the empirical evidence since there are an infinite number of other theories that can explain the exact same set of data.