You know him best as the author of 'Alice's Adventures in Wonderland.' But one writer suspected him of being Jack the Ripper.

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Donald Olson solves mysteries using celestial bodies.
For nearly 20 years, the truth surrounding the Durham, North Carolina woman's death has been shrouded in mystery—and bizarre theories.
Let this tool decode confusing parking signs for you.
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Don't worry—it's perfectly normal.
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Lithium is used in everything from smartphone batteries to medication for bipolar disorder.