Imagine your team is exploring nature, and you reach a stream or gap. There is no bridge, and it is not safe to cross. You cannot use glue, nails, or tape only the materials you can carry. Challenge question: How can we build a bridge that holds itself together using only smart structure and careful design? Leonardo da Vinci designed a bridge based on a clever interlocking pattern. Today, students will act as engineers: they will plan, prototype, test, and improve, then try a larger outdoor build to see how design choices work in real conditions.
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