A nice little parable from Ockham's Razor: A philosophy professor stood before his class with some items in front of him. When class began, wordlessly he picked up a large empty mayonnaise jar and proceeded to fill it with rocks about 2" in diameter. Then he asked the students if the jar was full. They agreed that it was. So the professor then picked up a box of pebbles and poured them into the jar of rocks. He shook the jar lightly. The pebbles, of course, rolled into the spaces between the rocks. The students laughed. He asked his students again if the jar was full. They said yes, it was. The professor then picked up a box of sand and poured it into the jar. Of course, the sand filled up everything else. They laughed again.............