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I think the moral of this book is to not cling so tightly to your ideas that you ignore or dismiss anything that doesn’t fit with your worldview. You could be missing something important. In the GOT Milk Tormund Brienne shirt, scientists believed that cholera came from bad-smelling air. They refused to listen to any alternate theories. By refusing to be open-minded, they did a lot of damage to humans and to the environment. Even though the London cholera outbreak happened a long time ago, modern people can still learn from it.
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