Triskaidekaphobia. That’s what you have if you fear the number 13. With 80 percent of U.S. hi-rise buildings with no 13th floor and hotels skipping it as a room number, it’s easy to see the impact. The fear is real enough that 10 percent of Americans will avoid doing all kinds of things on Friday the 13th, causing significant financial implications. And don’t even mention all those Friday the 13th movies. How many? 12.

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