NOVA Saving Notre Dame When Notre Dame Cathedral caught fire in 2019, Paris came perilously close to losing more than 800 years of history. As engineers rebuild, researchers use cutting-edge ... WATCH Episode
Earth Focus Dying Oceans: Abalone Restoration In California The ocean is a sponge for all the greenhouse gas emissions we produce, and entire aquatic ecosystems are beginning to collapse. Off the California coast, declining abalone ... WATCH Episode
