Mary Ellen Hannibal,author of Citizen Scientist: Searching for Heroes and Hope in an Age of Extinction and Dan Rademacher, executive director of the nonprofit mapmaker GreenInfo Network who’s helped organize more than a dozen grassroots bioblitzes in the Bay Area, talk withTerra Verde host and Earth Island Journal Editor Maureen Nandini Mitra about citizen science, it’s growing popularity, and how it’s changing established ideas about who can do science and how it is done.