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Geocaching is a world-wide treasure hunt using a GPS device or smart phone app. There are over 2.5 million geocaches around the world and with those devices, geocachers can locate a hidden container that can be slightly bigger than a thumbtack or the size of a car. (Photo by Joanna M. Kresge)

Geocaching is a world-wide treasure hunt using a GPS device or smart phone app. There are over 2.5 million geocaches around the world and with those devices, geocachers can locate a hidden container that can be slightly bigger than a thumbtack or the size of a car. (Photo by Joanna M. Kresge)

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