This news item is about: The citizen scientists of Bishop Loughlin Memorial High School stood in the rain, their testing kits at the ready to take samples of the Hudson River’s murky water off Manhattan’s Chelsea Pier. It was a Tuesday afternoon in the fall, and up until today, they had been practicing their technique in the confines of the lab. Their mission: to assist researchers from Cornell University by collecting environmental DNA from the river that they could then test for the presence of invasive species.