Pierre Glynn- Chief Eastern Branch of National Research Program in Hydrology, USGS, Reston, VA. The slow, the fast, and the unseen: why the less visible matters. Find out how to notice the less visible. Learn about long-lived, short-lived and small biological species, the imacts of groundwater and lightning, cascading consequences, subtle changes, and once in a human lifetime events, many of the processes that can end up making a big difference in RMNP ecosystem.