Enthusiasm is an emotional affiliation to an interest, cause or activity that influences actions, passions and performances in space. This paper explores what it means to have an enthusiasm for science and technology through examples of collecting, hoarding and tinkering with obsolete technologies, as well as counting, monitoring and recording wetlands birds and trees. Bringing together the fields of public history and citizen science, this paper identifies some of the ways in which these long-standing fields might work together in museums.