 A second candidate for being a contingent proposition that is knowable a priori comes from John Turri. He claims that the proposition, “The most unlikely possible event is not presently occurring”, is contingent yet can be known simply in virtue of understanding its content, and hence is knowable a priori (2011: 337–338). “The most unlikely possible event” refers to an event that is maximally improbable. So we know a priori that no one could have sufficient reason to believe that an event that fits that description is now occurring. Still, it is possible that such an event is presently occurring. Thus we can know a priori that the contingent proposition that says that a maximally improbable event is now occurring is false, and that its denial is true.