Inflate the balloon. Rub it with a woolen mitten and bring it to fine salt or semolina sprinkled on a piece of paper. What are you seeing? How can this experience be explained?
When rubbing a balloon with wool, invisible negative charges move from the wool to the balloon, As a result, the charge balance of the balloon is disturbed. Charges coming from outside will give the ball an overall negative charge. If you bring the ball to fine salt or semolina, they will stick to the ball due to static interaction.
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.