Photo: Getty Images

What You Need:

• Cooking oil, such as vegetable oil
• Cold water (no ice)
• Salt
• A glass
• Food coloring

What You Do:

1. Fill the up glass to about three-quarters full of cold water.
2. Stir in a few drops of food coloring. Can you guess what will happen when you add oil to the water.
3. Add some cooking oil until you have about a medium layer of oil on top of the water.
4. Wait until the oil and water have separated into two layers before the next step.
5. Sprinkle salt on top of the oil. Keep adding salt to see what happens.