how do you make slime with glue and cornstarch?
['Pour 1/4 cup white school glue and a 1/2 cup of cornstarch in a bowl.', 'Add 3 drops of food coloring (optional).', 'Mix it well.', 'Knead it with your hands for 10 minutes.', 'Heat it in the microwave for 20 seconds.', 'Let it cool, then knead it for another 10 minutes.']