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Citizen science projects invite members of the public to —participateparticipationparticipatingparticipated in genuine research, from counting garden birds to classifying distant galaxies online. Because volunteers can process far more data than a small team of —researchersresearchresearchingresearcher's ever could alone, entire fields have accelerated their discoveries. Researchers must still design tasks carefully, however, so that results remain —reliablereliablyreliabilityrelying even when contributors lack formal training.