You have a ping pong ball at the end of a curvy, long, skinny hole in the ground. You want to get it out but you can’t stick your hand in it won’t reach or fit. A string won’t work because you won’t be able to attach it.
What can you do to get it out without digging a hole?
REVEAL THE ANSWER
Put water in the hole. The pingpong ball is light and will float to the top.