“Do whatever it takes to avoid fooling yourself into believing that something is true when it is false, or that something is false when it is true. This approach to knowing enjoys taproots in the eleventh century, as expressed by the Arabic scholar Ibn al-Haytham (AD 965–1040), also known as Alhazen. In particular, he cautioned the scientist against bias: “He should also suspect himself as he performs his critical examination of it, so that he may avoid falling into either prejudice or leniency.”2 Centuries later, during the European Renaissance, Leonardo da Vinci would be in full agreement: “The greatest deception men suffer is from their own opinion.”