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A citizen science program that began over a decade ago found that dragonflies can be used to measure mercury pollution. Research ����Ӱ�� , director of Dartmouth’s , explains the national research effort, which grew out of a 

“It’s an important possible way for us to determine whether national and international policies on controlling mercury are effective,” says Chen. “The dragonfly as a ”biosentinel“ or bioindicator may be a very useful method for determining change across the landscape as well as change through time.”