Researchers have discovered a cache of marijuana at a 2,700 year old tomb in a remote area of central China. According to a paper published in the Journal of Experimental Botany, the grave was the burial site of a shaman, who was interred with nearly 800 grams of cannabis probably intended for medicinal or divinatory purposes. It is, according to the researchers, "the oldest documentation of cannabis as a pharmacologically active agent."

This find provides an interesting glimpse into the ancient relationship that exists between the plant and humans.