Economics has developed as a science that studies human behavior at the level of interactions between people, institutions, and any combination of these. While economics is a newer science than natural sciences (such as physics and biology) in a formalized way, it has developed significantly in the past century and it has spurred many branches of interdisciplinarity with other sciences. Unlike other sciences though, economics has also been subject to lots of internal frictions and disagreement among its scholars and scientists. But all this interesting history of science of economics also makes it a rich field and repository for exploring theories and methods that can be applied in other sciences as well.