As the Universe expanded and cooled the particles moved slower. They began to feel an electric force pulling them towards each other. The electrons carried something called a negative electric charge. Protons on the other hand carried a positive electric charge. These opposite charges attracted, pulling the particles towards each other.

So why does the balloon stick to the ceiling? I asked him
"As you rub, you pull electrons off the balloon onto the wool. This gives the balloon a positive charge (because it is short of electrons). When put near the (b) ceiling it attracts electrons in the ceiling. They move slightly downwards towards the balloon, so giving the surface of the ceiling a slight negative charge. The negative of the ceiling and the positive of the balloon attract and hold the balloon up." he said. I began to wonder what I would have for lunch.