Quagga mussels came to the U.S. from the Dnieper River, one of Europe's largest rivers. Introduced to the Great Lakes in 1986, it took almost 20 years for quagga mussels to be transported across the United States and be discovered in the Lake Mead National Recreation Area. Since their discovery in 2007, many have asked, 'How do we get rid of them?' This is a great question to pose to students and life-long learners.