The Mad Hatter has a basis in real history. In the 18th and 19th centuries, mercury was used to treat felt used in the production of hats in England. Workers in hat factories were exposed to toxic levels of the heavy metal and often led to the onset of dementia.

The Mad Hatter has a basis in real history. In the 18th and 19th centuries, mercury was used to treat felt used in the production of hats in England. Workers in hat factories were exposed to toxic levels of the heavy metal and often led to the onset of dementia.

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