For a practice that has been around in some form for over a century, citizen science has a seeming newness those familiar with its history might not expect. Speculation on why citizen science has gained significant traction in the last few decades—even gaining its familiar banner of “citizen science”—often points to the emergence of online tools for data collection and sharing, and there are websites such as SciStarter that work to coordinate projects and volunteers, and scientists are increasingly turning to the practice insofar as numerous conferences dedicated to citizen science have been held. Despite the threads that lead back a century, the situations to which citizen science projects and citizen scientists respond have notably distinct characteristics from their antecedent forms, and so the current swell of interest in the enterprise is not all together unexpected. Indeed, there is much...

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