NASA Explorer Schools invests in science, technology, engineering and mathematics, or STEM educators to inspire and engage future scientists, engineers and technicians that NASA needs to continue our journey.
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Without the Exploratorium, we might never have had an official Pi Day celebration. In 1988 Exploratorium physicist Larry Shaw started the tradition, and it was finally recognized by Congress in 2009. The Exploratorium highlights some great hands-on activities, and there is also a great list of Pi-related links.