Since it is a 12 digit number, there are chances of mistakes in day to day life. However, ISO has introduced the check digit, using which one can identify the correctness of the ISIN number. The check digit helps in identifying the errors in previous 11 bits.
Helen Adams Keller (June 27, 1880 â June 1, 1968) was an American author, political activist, and lecturer.
Biography Online. Helen Keller Biography. Helen Keller (1880-1968) was an American author, political activist and campaigner for deaf and blind charities. Helen became deaf and blind as a young child and had to struggle to overcome her dual disability.