Fig. 1. A variety of sensor networks in the United States and elsewhere allow students to ask scientifically relevant questions. (left) U.S. Geological Survey stream guage near Augusta, Maine. Credit: Nick Stasulis/USGS. (middle) AmeriFlux gas flux sensor near Bondville, IL. Credit: ORNL/FLUXNET. (right) U.S. Climate Reference Network weather station, Capitol Reef National Park, Utah. Credit: NOAA