Here are 5 surprising facts about St. Patrick's Day you may not have already known.

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    1

    First St. Patrick's Day Parade

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    2

    The Truth About Shamrocks

  • Alain Le Garsmeur
    Alain Le Garsmeur
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    3

    It's Not Easy Being Blue

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    4

    Chicago Goes All Out

    While New York has the biggest St. Patty's Day parade in the country, Chicago wins the prize for 'Most Irish Spirit.' The city of Chicago uses a mixture of vegetable dye and other compounds to dye the waters of the Chicago River green each year.

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    Tristan Fewings/Getty Images
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    5

    St. Patrick's Secret Identity

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