Put a couple of drops of food coloring onto a plate. Use a toothpick as your paintbrush. Paint a design or face onto a sugar cube.1 Pour baking soda into small bowl or plastic bag. Roll sugar cubes in baking sugar, making sure that the cube is coated on all sides. You can save these later for a lemonade stand, or use them immediately.1Prepare lemonade by mixing 2 cups water, 1/2 cup lemon juice and 1/4 cup granulated sugar. Mix well and pour into individual glasses.2Drop coated sugar cubes into the glasses. Cubes will fizz as the citric acid and baking soda forms a carbon dioxide gas.3Drink and enjoy!4 Science experiment created by Liz Heinecke. Liz shares her love of science through her blog, The Kitchen Pantry Scientist and she recently published her first science book: Kitchen Science Lab for Kids, a book of 52 fun and educational science projects for kids of all ages.Photos by Amber Procaccini.