A class of Half Day school fourth graders walk on an interactive map of North America. National Geographic brought the room-sized map to Half Day School for the students to further their knowledge of geography. | Michelle LaVigne~Sun-Times Media

Half Day School fourth grade teacher Gloria Petroski talks about different regions in North America to her class. | Michelle LaVigne~Sun-Times Media

The feet of two fourth graders rest on provinces as instructed by their teacher, while their class explores a room-sized National Geographic map brought to Half Day School. | Michelle LaVigne~Sun-Times Media

Nine-year-old Half Day School fourth graders from Gloria Petroski's class crowd up on to the north pole after being instructed to follow likes of longitude furthest north. | Michelle LaVigne~Sun-Times Media

Nine-year-old Half Day School student Segi Odongo of Buffalo Grove finds Alaska as instructed by his fourth-grade teacher Gloria Petroski while her class learns about geography on a room-sized map of North America. | Michelle LaVigne~Sun-Times Media