 I have read in a book about Cleopatra that she had both a son and a daughter. My set of beliefs therefore contains both \(p\) and \(q\), where \(p\) denotes that Cleopatra had a son and \(q\) that she had a daughter. I then learn from a knowledgeable friend that the book is in fact a historical novel. After that I contract \(p\vee q\) from my set of beliefs, i.e., I do not any longer believe that Cleopatra had a child. Soon after that, however, I learn from a reliable source that Cleopatra had a child. It seems perfectly reasonable for me to then add \(p\vee q\) to my set of beliefs without also reintroducing either \(p\) or \(q\). This contradicts Recovery.