It is a force. It makes things fall down. A big thing has a force field. A very big and heavy thing sort of pulls other things towards it. A man saw something you can eat that dropped from a tree. He had a think about why it fell. People say little things work like this too but you have to be good at knowing about numbers to explain it. http://splasho.com/upgoer5/ OK, try to explain the difference between a scalene and a right-angled triangle using the text editor.