We humans are a superstitious lot, believing that Friday the 13th is bad luck and finding a penny is good luck.
Many superstitions stem from the same human trait that causes us to believe in monsters and ghosts: When our brains can’t explain something, we make stuff up. In fact, a study last year found that superstitions can sometimes work, because believing in something can improve performance on a task.
Here, then, are 13 of the most common superstitions.
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