This episode continues the series on the past, present, and future of one of the most important natural resources on Earth, the Great Lakes.  In this episode we'll explore aquatic aliens among us.  Invasive species are more than just a present nuisance in the Great Lakes Watershed.  They also poise a serious ecological threat to the future of the Great Lakes.  Learn about different types of invasive species, including mussels, water fleas, gobies, crayfish, lamprey, and carp, as well as what is being about these pests.