The liquid, they must have drugged me, thought Matt. He saw a man raising a spear high above. In a fl ash he thought of Kim but was unable to coordinate his thoughts or even to turn his head to check on his friend. Everything became blurred. The spear came down, and he felt a sharp, piercing pain. This is the end? That was his last thought; after that, there was nothing. Three year 9 students perform a routine experiment in a school laboratory and...