Benjamin Rush and the story of Calomel: Lessons for Today about Gadolinium
George Santayana is credited for saying the original variant of the quote: "Those who do not learn from history are doomed to repeat it." In some ways the story of Calomel ( a mercury-based drug) and gadolinium-based contrast agents (gadolinium-based ofcourse), share some properties. I do not intend to represent those shared qualities, as all of the truth; but they are some, starting with that they are both heavy metal-based drugs that were (Calomel) and are (GBCAs) highl