When I was at uni my mother had a job as a nursery school teacher. One of the projects they did was to look at forces (quite good really!) So, they pulled ropes

When I was at uni my mother had a job as a nursery school teacher. One of the projects they did was to look at forces (quite good really!) So, they pulled ropes, and dropped apples, and sailed boats and used magnets. She asked me to think of a simple explanation of how the magnets worked so that the children could understand them. It is painful to me that I could not do that, and I can't do it now and I believe that no one can!