Skyline Middle School, in Harrisonburg, Va.,sixth grader Rebecca Lopez, 11, laughs while holding one end of a 100-foot tape to measure the width of the North River during an outdoor science lab at Bridgewater's Sandy Bottom Park Wednesday morning Sept. 26, 2012. Helping to calculate the area of the stream were a couple of her classmates and Harrisonburg DEQ's Water Quality Coordinator Tara Sieber. (AP Photo/The Daily News-Record,Nikki Fox )
