Back in the early 1900's, a canary would accompany a coal miner during his work. If they canary got sick, it was a sign to the humans that toxic air was present and the workers should get out of the mine immediately. In this episode, Mark chats about "canary-like" indictors that MUST accompany our work. These indicators are custom-made for each person, and they serve to protect us from overworking, as well as reward us and reassure us we are on a pleasant path toward prosperity.