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Some 7,500 acres of the state natural area 's backcountry make up one of the nation 's largest and most unusual karst preserves where water " recharges , " or enters the Edwards Aquifer through sinkholes , caves and fractures in the porous limestone surface that predominates in the more rugged part of Government Canyon . Heidi ’ s mom has a vocabulary of only twenty-three words , but the most unusual one is “ soof , ” a word that only she knows the meaning of . One of the exhibit 's most unusual venues is an arts-oriented public high school in Barrington , Illinois . One of the program 's most unusual projects consists of three hinged door panels for displaying photos and memorabilia . One of the best and most unusual sauces is the black olive and caper creation .