Quarantine with a disinfecting stove, have a right to navigate the Canal, in quarantine, subject only to the landing of those who were suffering from plague. Plain yellow, green, and even black flags have been used to symbolize disease in both ships and ports, with the color yellow having a longer historical precedent, as a color of marking for houses of infection, previous to its use as a maritime marking color for disease. The present flag used for the purpose is the "Lima" (L) flag, which is a mixture of yellow and black flags previously used. It is sometimes called the
What Is and What Should Never Be (Supernatural) its original broadcast, "What Is and What Should Never Be" was viewed by an estimated 3.11 million viewers, one of the lowest ratings for the season. Conversely, writer Raelle Tucker won the Constellation Award for "Best Overall 2007 Science Fiction Film or Television Script" for her work on the episode, and the episode garnered positive reviews from critics. Tina Charles of TV Guide "adored" the episode, and considered it to be Jensen Ackles' best performance of the series. She experienced an "emotional roller coaster the entire hour", finding Dean's monologue at his father's grave to be "crushing" but the lawnmower