A man was once put in a dark cave. He was sentenced to die in the cave unless he could find his way out. The cave was 100 yards by 100 yards and he was told that there really was a way out.

The cave was sealed by a very large rock. After the cave was sealed the prisoner was allowed to take off his blindfold. In the midst of the darkness he walked around the cave. He had food, but it was bread and water which would only last for thirty days. The food was lowered to him from a hole in the ceiling of the cave which was about eighteen feet high. The opening was only one foot in diameter.

The man investigated the cave and soon discovered that there was a pile of rocks. He quickly determined that if he could build up the pile of rocks even higher, perhaps he could escape. By calculating both h…