I was peeling some salsify I had grown, actually a leftover root I somehow overlooked plucking over the winter that I pulled upon just yesterday, satisfyingly. They have this sort of sticky sap that oozes out when you nick them and I started to wonder how long it took people to find out this vegetable was safe to eat. I mean somehow associate a sticky white sap with something potentially poisonous but this is an unnecessary example anyways. But, do you get what idea I am am trying to peel and coax out of you, about: food and toxicity, the length of human learning way back in millennia of yore? Simply curious.