Beakman explains how refrigerant inside of a refrigerator works and involves compression and heat absorption. He uses a demo of compressed refrigerant to show that, although it boils when not compressed, it's still cold. He follows up with an animated explaining how the inside of a fridge works.
Charlie explains radiocarbon dating and how it is used to calculate the approximate age of an object. To make his explanation more concrete, he uses an analogy involving a refrigerator and the number of ice cubes in it.