if you can solve this i'll give you 10 bucks
you are in a concrete room. There is a steel pipe 25 centimeters in length cemented into the center of the concrete floor. The pipe protrudes about 15 centimeters. A ping-pong ball is dropped down the pipe. There is a fraction of a centimeter clearance around the ping-pong ball and pipe. Your task is to get the ping-pong ball out fo the steel pipe undamaged. The only items that are available are a wooden ruler, a ball of string, a pocket mirror, a paper clig, and a small magnet. Since nothing else is allowed into the room, how could you get eh plastic ping-pong ball out of the steel pipe?