"an encyclopedia" (11) by Hasnain Walji. Dioscorides was the first to use willow, the source of aspirin, to cure pain.
             Avicenna, an Arabian doctor and alchemist added to this information in the 11th century. He invented the process of distillation to extract plant essences, which are now called essential oils. Many of the processes of this distillation technique are still in use today. His book, "Canon of Medicine", w
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