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Focus Question: What is the strongest shape for building? Materials: Paper, sticky tape, straws or rolled-up paper tubes, a few books for testing. Beginner (5 mins):Shape Poll Seesaw Activity: "Which shape do you predict will be the strongest for building: a square, a circle, or a triangle? Circle your choice on the template." Beginner (5 mins):Bridge Builders First, make a square and a triangle using straws or rolled paper tubes taped together. Gently push on the corners. Which one changes shape easily? Which one is rigid and strong? "Your engineering challenge is to build a bridge from a single sheet of A4 paper that can span a 15cm gap between two desks or books." "How can you fold or shape the paper to make it stronger? Think about the strongest shape you discovered!" "Test your bridge by carefully placing one light book or object on it at a time. How much weight can it hold before it collapses?" Online Interactive: Students can explore the PBS Kids Bridge Builder Game https://pbskids.org/dinosaurtrain/games/bridgebuilder.html to test different bridge designs virtually. Exit Slip (10 mins): Bridge Success! Activity: Post a of your strongest bridge design. Use the tool to point to the part that you think made it so strong and tell us how many books it held.