I thought this was interesting because of the insight it gives to ancient and mediaeval medicine, especially because in fantasy modern writers tend to try and promote the idea that their healers are following some for of scientific method with their herbology, when the reality would have been a lot different:
phys.org
The tools in a medieval Japanese healer's toolkit: From fortunetelling and exorcism to herbal medicines
"The Tale of Genji," often called Japan's first novel, was written 1,000 years ago. Yet it still occupies a powerful place in the Japanese imagination. A popular TV drama, "Dear Radiance"—"Hikaru kimi e"—is based on the life of its author, Murasaki Shikibu: the lady-in-waiting whose experiences...