 For some, the no learning condition might be too harsh, as it seems to say that the passage of time never helps to increase knowledge. A related but more reasonable condition is that of no miracles, introduced in a slightly richer setting in van Benthem and Pacuit (2006), which states that the uncertainty of the agents cannot be erased by the same  event.[15]  A further interaction property is that of synchronicity, which states that epistemic uncertainty only happens among epistemic situations that occur at the same moment of time. For example, the agent always knows ‘what time it is’, as she might not know which action was executed, but she always knows that some action has taken place.