No one believes this one-of-one Helen Keller item just sold for thousands of dollars

Many readers are convinced that a piece of Helen Keller memorabilia could not possibly be real.Keller, noted as being a deaf and blind humanitarian, educator, and writer who wrote 12 books, has been swept up by the latest craze of memorabilia resale.'What a time to be alive.'In fact, the genre is nearly unheard of, as it exists as a hybrid of two separate collector's items: trading cards and historical signatures.That's right, Keller's signature was just auctioned off as a trading card — and it...