Dylan Petsche recently attended the Southern Minnesota Regional Science Fair held at Minnesota State Mankato. His project, 'Which Beverage Stains Your Teeth The Most?' was awarded a Purple ribbon and won a Silver Medal and Wal-Mart Gift Card. There were 61 school districts represented. Dylan used egg shells (eggshells and teeth share a compositional element, calcium) and soaked them in Coke, Tea, Coffee, and Grape Juice where Grape Juice stained the most. Dylan is in Mrs. Prchal's 5th Grade…