Petty Officer 2nd Class Brett Rielly, a boatswain's mate stationed at Coast Guard Station Juneau, Alaska, writes out an equation used to calculate distance in Jody Levernier's sixth-grade math class at Dzantik'i Heeni Middle School April 19, 2013. This event marked the fifth consecutive year that Levernier invited Coast Guard personnel to her class to show students how practical math is in the real world. U.S. Coast Guard photo by Petty Officer 3rd Class Grant DeVuyst.