In "Emily's Science Lab: Waterproof Cocoa Experiment," host Emily Calandrelli explores the fascinating properties of cocoa powder. This educational video introduces viewers to concepts such as hydrophilic and hydrophobic substances, illustrating how starch in cocoa absorbs water while fat repels it. Through a simple experiment, Emily demonstrates how water tension and molecular energy allow cocoa to dissolve in hot, but not cold, liquids. The video emphasizes the importance of understanding material properties and chemical reactions, captivating young audiences with relatable everyday science.