What Things Come in Threes?

By Staff WriterLast Updated Apr 4, 2020 2:42:14 AM ET
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Kevin Dooley/CC-BY 2.0

It is a common belief that bad luck, especially relating to death, comes in threes. For instance, whenever two celebrities or public figures pass away, superstitious people expect a third death to occur relatively soon after. In truth, the superstition is simply a form of confirmation bias.

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