Who was Helen Keller? An extraordinary example of revenge on deafblindness

Helen Adams Keller was an American writer, activist and teacher, deaf-blind since the age of 19 months. Her story and that of her teacher Anne Sullivan, it is surprising and unique, for will, determination and strength, so as to have inspired several movies (Deliverance, The Unconquered, Anna dei miracoli, The Miracle Worker).
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What is the shape of deafblindness?

What is this strange white thing? A stone? A shell? A bone? A sculpture? As you try to guess, I think it is very difficult to understand what it is, unless you know the name: Deafblind Shape. Maybe then you can make a more plausible hypothesis.
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