Prejudice is its own logic, or, at least, it is impervious to logic, evidence, or critical thinking. This week we'll consider the irrational beliefs behind many of our prejudices. We look at the early American assumption that Native Americans, Africans, and Asians were somehow less than human and then we pay special attention to the case of the British mathematician, Alan Turing, who was of unique importance to both winning World War II by breaking the German Enigma code, and later laying the groundwork for the invention of the computer. In just a few years after the war, Turing was put on trial for being gay and chose suicide over the chemical castration imposed on him. Considering our history of prejudice shines a particular light on the current violence against the trans community.