After enjoying reading the Billy Goat Gruff fairy tale, the grade 3 students in Ms. Cowan’s class were given the task of designing a bridge for the troll to live under. Materials used were mini-marshmallows, toothpicks, and paper. The bridge had to be sturdy enough to hold people on it. As the students explored different designs, they learned that using triangle shapes for the base structure was the strongest geometric shape to use. Celeste said, “I could make my bridge stronger by using more support material…more toothpicks and marshmallows”. “Your first plan might not work, so you have to try again,” said Harleen.