Grassroots science is science done by people outside the mainstream of professional science. Grassroots science includes research by amateurs and lay people as well as some dissident work by professional scientists.
Science - both professional and grassroots - involves the creation and use of systematic knowledge, using standard procedures, within a community of practitioners, involving both theory and experiment. Scientific knowledge is public knowledge, within the practitioner group and often beyond, thereby excluding some proprietary knowledge generated within corporations and some secret knowledge generated within intelligence agencies.
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