Did you know there could be something other than water in the rain? Have you ever seen a tree breathe? Did you know that not all scientists wear lab coats? Visit the University of Maryland Center for Environmental Science's Appalachian Laboratory for a free Open House on Saturday, May 2, from 10 a.m.- 2 p.m. to find out. Learn about Maryland’s flying mammals, what lurks in pond scum, and more.