brooklyn students collect water samples to test for the presence of invasive species. credit: cornell universityinvasive aquatic species like round goby, asian carp, and sea lamprey are a growing problem in new york state. their presence impacts water quality, food supply, recreation and tourism, as well as human and animal health. early detection is a critical first step in monitoring a species' spread and managing responses. scientists at cornell university's college of veterinary medicine have devised genetic tests that can detect the environmental dna (edna) of invasive species in a waterway before they become established there. but there are more than 7,600 freshwater lakes and ponds and over 70,000 miles of rivers and streams in new york state, all of them potential conduits for the unwelcome species. how can the cornell team watch them all for signs of a potential invasion? the answer: teams of young citizen scientists from schools located near a lake, river, or creek, who...