Knowing all the answers isn’t the priority in Mary Selby’s busy third-grade classroom at Eisenhower Elementary School. In a recent science activity Mary asked her 25 students to examine part of an animal skeleton and explore what they saw. Working in small groups, the students used their reasoning skills to discuss what the bone was and why. In the end, the students learned how to explain and support their thinking as they worked through the process of identifying the animal bone.