There are substances that are soluble in water, and there are also soluble in oil. Place one pinch of grated and dried carrots in a glass of water and the other in a glass of petroleum jelly. Rubbing the carrots with a stick, see if the liquid is colored.
In a glass, where the carrots with oil change color, they will turn yellow-orange. This is because the oil draws out the orange cell juice from the cells and the oil solution turns carrot-colored. This does not happen in a glass of water.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.