 Let A and B be events. A storm, a person getting sick, a soccer player scoring a goal, and a scientific measurement yielding a specific result are all examples of events. Assume we can meaningfully assign probabilities to these events occurring. Reichenbach himself developed a sophisticated frequency interpretation of probability (Reichenbach 1949), but we will assume only that some kind of objective probability can be meaningfully applied. Suppose that events A and B are positively probabilistically correlated: 