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Students begin by determining dew point using an aluminum can, stirring rod, ice and thermometer. Air temperature is also measured and recorded. Students then use those two data in conjunction with the Lifting Condensation Level approximation, to estimate the base altitude of visible (low level) clouds. The Students' Cloud Observations On-Line (S'COOL) project engages students in making and reporting ground truth observations of clouds then comparing those observations with data from the CERES satellite instrument.