Recently, I read a quite fascinating account of that scourge of the seven seas: Scurvy.
It can be found here along with the author’s musings on the loss of medical knowledge, the limitations of science, and the pervasiveness of ignorance.
It is quite the read, detailing how precious information can be, and the process by which we can lose it by forgetting, as well as lose it by replacement.
Needless to say, I’m reading the book.