Cardboard is a remarkable material. While it’s made of nothing more than paper, it’s strong enough to ship heavy and fragile objects all around the world. The secret to its strength lies in its middle layer, which curves up and down like waves in the sea. Those waves are a series of up and down facing arches, like the arches that support bridges and buildings. And you can build bridges, buildings, and a lot more from leftover cardboard in your own home.
This week, we’ll create marble runs, fashion hats, build new worlds, and so much more — all with cardboard!