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  This is Bill, a British sailor that spent way too much time sailing the Seven Seas... Over time, Bill and his comrades started getting ill; fatigue, gum bleeding, etc. What they did not know was that the disease that was making them feel like that was scurvy. Thus, they did not know how to cure themselves!
  But one day, Bill's ship arrived to an island that had plenty of lemon trees (what a coincidence, right?). Bill -who was always hungry, by the way- saw those trees full of lemons and picked those fruits from their branches to eat them later. Once he started sucking the juice out of them, he began to feel better. He found the cure to his illness!