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Independence Day
Independence Day

Number 13

The number 13 is considered unlucky. The fear of this number in our culture is demonstrated regularly -- more than 80 percent of high-rises lack a floor marked 13, many airports skip the 13th gate, airplanes have no 13th aisle. Jack the Ripper and Charles Manson both have thirteen letters in their names. We could go on but you get the picture. Getty Images