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We have id number, license number, credit card number, our marks, our property, our temperature, our BP, all are digits, why? They can be stored electronically in a small space. A thumbnail-sized chip can contain volumes and volumes of info. Data can be compressed easily. Compressed data can be transmitted easily. An email arrives in no time. The digital info can be encrypted and decrypted easily. Due to encryption, your credit card info. is safe. ...
