 Ted is on his way to the Philosophy Department, early in the freezing morning. Although he doesn’t know how cold it is, Ted conjectures that the temperature must be below 0 °C. Out of curiosity, he checks the weather app of his smartphone. To his astonishment, he sees that it is −30 °C. He concludes that this is the least temperature to which he has been exposed ever. Ted’s belief about his personal record owes its justification to Ted’s belief that it is −30 °C, justified by the evidence supplied by his smartphone, and Ted’s acknowledging that if it is −30 °C, then this is the least temperature to which he has been exposed ever. When one’s belief q derives its justification from the justification that one has for another belief p in this way, it has become customary to say that the justification for p transmits to q across the inferential link from p to q.