abandon that belief just because you were stumped. Your belief would still be correct. The fact is that most things we believe are like this. We haven’t had time to personally investigate each and every belief we hold—instead, we rely on other authorities. A person might believe that E=mc2, that Constantine won the Battle of Milvian Bridge, and that her grandfather was born in George, Iowa. But few could defend these beliefs on the spot if pressed by a determined critic who was eager to question