What exactly is cancer?

Martin sits thoughtfully in the kitchen with his aunt, who had cancer, and asks her what cancer exactly is. She then tells him the story of the "cellings" in the human body. Slowly, some cellings turn into "cancerlings," because they are angry about the "rubbish" in the human body resulting from wrong nutrition or air pollution we breathe in. They are spreading and threatening the cellings. A figh...