WHY IS THE NUMBER 13 CONSIDERED UNLUCKY

The General feeling that the number '13' is unlucky is just a superstition. This number is considered unlucky in almost all the countries of the world. Even many hotels don't have a 13th floor. In some hospitals there is no bed bearing this number. Many people do not have 13 persons at a dinner table. Yet strangely enough there is no single accepted explanation for the origin of the superstition. According to some experts '13' was an unpopular number from the time man learned to count. By using his ten fingers and two feet as units, he could count up to 12. But beyond that, things were unknown and frightening to him.Whatever may be the reason of considering 13 as unlucky number, it has no specific basis. No number is lucky or unlucky. They are simply numbers, used in mathematical calculation.