Oh no! Structura built a beautiful bridge out of cooked spaghetti, but it just collapsed under the weight of a single brave pea! She needs to learn the secret of strong shapes. A) The Story of the Strong Triangle and the Wobbly Square. B) To build a strong bridge, is it better to use a flat shape or an arch shape underneath? C) Let's make a strong bridge with our hands for a toy car to drive over!