Two men were walking through the woods and came upon a big black, deep hole. One man picked up a rock and tossed it into the hole and stood listening for the rock to hit bottom. There was no sound. He turned to the other guy and said “that must be a deep hole…let's throw a bigger rock in there and listen for it to hit bottom.” The men found a bigger rock and both picked it up and lugged it to the hole and dropped it in. They listened for some time and never heard a sound. Again, they agreed...