Do celebrities really die in three? Actor Malcom-Jamal Warner, singer Ozzy Osbourne and professional wrestler Hulk Hogan died in late July, prompting Google search around the “rule of three” to spike.

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Prefer Newsweek on Google to see more of our trusted coverage when you search. A bizarre "Rule of Four" has been identified in the basic structure of the majority of inorganic materials—and scientists ...