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Marc and Trini relate temperature to each other as they make ice cream and candied apples respectively. Lisa demonstrates extreme cold temperatures with liquid nitrogen. A ""volcano chaser"" visits the workshop to discuss volcanoes. On location, Lisa visits a glassblower. She also visits a volcano that is almost ready to erupt. (This is different from the footage used in Episode 14.)ANIMATION: Increasing heat of objects in degrees Celsius.THE BLOODHOUND GANG: ""The Case of the Professor's Fleas,"" a one-shot mystery surrounding a flea circus that has had all its stars stolen.