There are always new wonderful things that U learn - things that never caught Ur attention.
I found out a few interesting things about credit card numbers recently.
Did U know that all VISA/MasterCard credit card numbers start with "4" ???
Did U know that it is possible to do basic validation of a credit card number without even hitting any database ???
For more such interesting things about Credit cards, follow these links:
http://www.merriampark.com/anatomycc.htm
http://euro.ecom.cmu.edu/resources/elibrary/everycc.htm
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