The Ozark Natural Science Center, tucked away in the woods outside Huntsville, offers programming in Arkansas's flora, fauna and geography to grade-school children on its trail system and in its teaching facility. If you've been to ONSC — maybe to see the Northern Saw-whet owl, the subject of recent research there by a University of Arkansas ornithologist — you know it's a great place, with a cave system, waterfalls, creeks and Ozark uplands, located on the 500-acre Arkansas Natural Heritage Commission Bear Hollow Natural Area.