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Colton Penetac, right, looks for macroinvertebrates with dad Mike as Nunaka Valley Elementary School fourth-graders participate in Water Discovery Days on Thursday, September 15, 2016, at Campbell Creek Science Center. The 16th annual event offers 860 local fourth-graders an opportunity to explore Campbell Creek, study salmon, and learn about macroinvertebrates: what they are, where they live, how they survive and why they are indicators of a healthy watershed. The three-day event concludes Friday. (Erik Hill / Alaska Dispatch News)