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Welcome to the Poison Garden: Medicine’s Medieval Roots

The science of using plants to treat human ills is as old as mankind itself. The only problem with this “science” is that it’s always a trial-and-error endeavor: Use a plant in the wrong way or dosage and it can kill as easily as it could possibly help. A tour through the Poison Garden in England highlights plants that can both kill and help. As noted by NPR, some of the plants in the Poison Garden are marijuana. It’s true that plants can be both deadly and helpful....