The acceptance of a manuscript for publication in a scientific journal is an indication that the contents of the manuscript have been approved by the scientific journal on the basis of current scientific validity. The approval is made through the process of peer review in which a few scientists who are experts on the manuscript's contents review the manuscript. Reviewers spend a lot of time on evaluating each manuscript, and in such a sense, peer review entails much hard work. Reviewers offer valuable advice for free because they have an intense passion for the development of their area of research. In this regard, peer review is the fundamental basis of science. The main component of a scientific journal is original papers. In each original paper, the authors propose a clear hypothesis, test the validity of the hypothesis with the methods they adopt, and clearly state whether the hypothesis is valid or not. The evaluation of a scientific journal should be made on the basis of the quality, importance, and strength of the published papers and not the impact factor.