Fairgoers ride the Sky Glider during the Iowa State Fair in Des Moines on Thursday. The State Fair opened Thursday and will remain open through Sunday, Aug. 17. (Elizabeth Wood/The Gazette) Hannah Pratt sculpts a spur out of butter for one of the displays with the butter cow during the Iowa State Fair in Des Moines on Thursday. Sarah Pratt, the Iowa State Fair’s butter sculptor, said her daughters Hannah and Grace Pratt have been learning how to sculpt butter from her. In July, Sarah, Hannah and Grace went to Washington, D.C to carve a butter cow for the Smithsonian American Art Museum. Pratt said she and Rod Zeitler, of Iowa City, will have displays in the Smithsonian. (Elizabeth Wood/The Gazette) Grayson Rave (right), 9, and Amelia Rave (center), 8, cool off in front of a fan during

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