Parents and students!   You are invited to a day of hands-on science!   This will be a special program in cooperation with Bridging the Watershed.   Students from age 9 and over will take part in a watershed survey at Anacostia National Park, located at the boat ramp and nature center.  Parents must sign-up for this event no later than 31 May.   There are 15 slots available for the program on the 7th and 15 slots available for the 21st.   First Come, First Serve.  It will last several hours, and you must arrive at the park by 10 A.M.   Be sure to bring a lunch with you!