A rain drop forms in the sky and begins to fall. What path it takes, no one knows, but that it lands, we can surely assume. Meaning. Some precise things are ha

A rain drop forms in the sky and begins to fall. What path it takes, no one knows, but that it lands, we can surely assume. Meaning. Some precise things are hard to predict, even when the outcome is easily knowable. We can't predict where an individual molecule of O2 will be in a minute, but we know that if there is a pressure differential between two rooms, they will begin to equalize.