Bart and Gina visit a blacksmith to get their handcuffs removed. The blacksmith creates a key by heating up metal, shaping it in the desired manner, and then cooling it.

Glaciers appear on almost every continent. However, they are rapidly melting due to the warming climate.

Phil shows off several new materials that scientists and engineers have created. He mentions that they are created both for fun and for practical applications. He describes several new materials, such as a thermochromic mug and nitonol wire, and demonstrates how they work.

The narrator explains how sedimentary rocks form: from sediment deposited in water through the process of weathering and erosion. He also explains the layers of sedimentary rock, which include sandstone, limestone, and conglomerates.

One group of local fisherman in Kenya are building a boat entirely from plastic waste to raise awareness about marine plastic pollution.