The first thing The Traveling Professor does in the morning is open emails from travelers. This morning I received one from a traveler that (in part) read, "As a single traveler, I do not feel my fee [the single supplement] should underwrite the cost of a couple or two people in the same room. Single traveler do not use more services than coupled travelers; thus no need for a fee. Single supplements are discriminatory towards the single traveler.". So, let me take the opportunity to explain exactly what the single supplement is and why it exists and why nearly all single travelers pay it and how The Traveling Professor helps single travelers.