At an aquarium, Lisa and Trini learn about volume. Marc and Lisa head out to see a supertanker. Trini stakes her case about oil spills. This includes an extension of Trini's visit to the salt marsh in Episode 57. As a final gesture, Marc and Lisa remind Trini just how many common items come from oil.Film insert: how a school bus compares to a car in transporting kids.ANIMATION: Cubes illustrate volume; the vast volume of a supertanker.THE BLOODHOUND GANG: ""The Case of the 264-Pound Burglar, Part Two."" (Recycled from Episode 7) Vikki reveals that the weight card reading 264 pounds, was designed to throw them off the scent. They discover the real culprits, both of whom faked the weight card in preparation for the heist.