GRAND ISLAND, Neb. (AP) – Construction has started on an outdoor learning area at the Nebraska State Fair that’s designed to teach children about groundwater use. The nonprofit Groundwater Guardians raised almost $50,000 for the half-acre learning area. It will include a prairie maze, tree fort, rain garden and other features to teach children about how and why groundwater is used. The learning area is expected to be open for next year’s fair.  Groundwater Guardians says it will also accessible year-round for education activities.