A small team of Old Town High School science students is collaborating with University of º£½ÇÉçÇø researcher Sarah Nelson who is using dragonflies larvae as bio-sentinels for mercury in wetlands, stream watersheds and lakes across the Northeast. In their classroom laboratory, the science students have set up mesocosms — mini-ecosystems in the form of tanks read more Old Town Science Students Raising Dragonflies as Part of Uº£½ÇÉçÇø Research on Mercury Contamination