Thousands of gymnasts flock to this city to learn under Gabby Douglas’s mentor, Liang Chow. (10[1])To prevent Halloween vandalism in the 1930s, this city’s Playground Commission encouraged residents to only give out candy after trick-or-treaters told a joke. Jaume Plensa’s Nomade is in a garden in this city (-5[1])named for the Pappajohn family. This city’s Henry Wallace House is in its Sherman Hill District. This city’s tallest building is owned by the insurance conglomerate (10[1])Principal. (10[1]-5[2])The World Food Prize is administered from this city by the estate of Norman Borlaug. (-5[1])Waukee and Ankeny (10[2])are suburbs of this city, (-5[2])the site (10[1])of a state fair (10[1]-5[1])where Norma Lyon crafted hundreds (-5[1])of butter (-5[1])cows. (10[2]-5[1])The largest gold dome in the US is on a building in this city (10[1])that [emphasize] replaced the “Old Capitol,” which is now part of its state’s flagship university, represented by the Hawkeyes. (10[4]-5[2])For 10 points, name this capital of Iowa. (10[2])■END■ (10[8])