In most areas of life, we all are concerned with the truth. A cashier has to make sure he knows how much change he’s giving. A nurse has to apply just the right amount of medication to a patient. A mathematician checks and rechecks his proofs. A jury listens closely to all the facts to sort out the truth in a trial. A history teacher has to get the names and dates right. A scientist publishes work for peer review to make sure that everyone gets the same results. In all