Some people claim that evolution is “just a theory”. Do you know what a scientific theory really is? Just a theory is an overview of the modern concepts of science. A clear understanding of the nature of science will enable you to distinguish science from pseudoscience (which illegitimately wraps itself in the mantle of science), and real social issues in science from the caricatures portrayed in postmodernist critiques. Prof. Ben-Ari’s style is light (even humorous) and easy to read, bringing the latest concepts of science to the general reader. Of particular interest is his analysis of the terminology of science (fact, law, proof, theory) in relation to the colloquial meaning of these terms. Between chapters are biographical vignettes of scientists — both familiar and unfamiliar — showing their common commitment to the enterprise of science, together with a diversity of backgrounds and personalities. This accessible, informative, and comprehensive work will give lay readers a good grasp of real science.