The aticle presents several different ways of popularizing scientific knowledge. It is not scientific in the sense that it is not a report on a systematic study of the literature or empirical research. It is a tool room: a repository we can turn to in search of tools to help us solve a problem. The article offers three tools. The first is a typology of forms of participation in science. I treat the typology as a tool, too, because defining a problem can be seen as part of the problem -solving process. It's important to understand that there are different forms of science popularization and citizen science participation: each form requires different competencies and will work in a different situation. It's also important to understand that there is a difference between science communication (i.e., what scientists do as part of their work) and science communication (i.e., dis-semination of scientific results outside of science). These are two different modes of communication and require separate skills. The second tool is a set of heuristics that may be of interest to those already parsing science communication, but having difficulty communicating science. The last tool is a proposal for a science popularizer's checklist. It is based on my own experience. Anyone in-terested in science communication can check this tool in action, modify it for themselves, or create their own list, which I encourage you to do.