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In this activity, students face an engineering challenge based on real-world applications. They are tasked with developing a tool they can use to measure the amount of rain that falls each day. Students will find out why freshwater is important, learn about the water cycle, and the need to have a standard form of calibration for measurement tools. They will learn that keeping track of precipitation is important, and learn a little bit about how NASA's GPM satellite measures precipitation from space. This lesson uses the 5-E instructional model.