The check digit is used to confirm the initial digits of the card number. The benefits of using a checksum is that it prevents casual attempts to invent credit card numbers, as only one in ten will be valid.
Length (adj). the longest, or longer, dimension of any object, in distinction from breadth or width; extent of anything from end to end; the longest line which can be drawn through a body, parallel to its sides; as, the length of a church, or of a ship; the length of a rope or line.
Worldâs Longest Fingernails 30-Feet Long: Guinness World Records Feat Bittersweet. One man in India hasnât clipped the nails on one of his hands in 62 years, which makes them the worldâs longest fingernails on record at 30-feet. However, even with the longest nails in the world, which places him in the Guinness Book of World Records, Shridhar Chillalâs feat is bitter and sweet.