Valentine's Day traces back to ancient Rome, honoring the fertility festival Lupercalia.
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Around a billion Valentine's Day cards are exchanged globally each year.
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Over 58 million pounds of chocolate are sold during Valentine's week.
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The heart shape was first associated with love in the 15th century.
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Cupid, the god of love, is derived from ancient Roman and Greek mythology.
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Valentine's Day is a popular day for marriage proposals.
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Roses are the most popular Valentine's Day flowers; red symbolizes love.
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Multiple saints named Valentine are associated with the holiday's origin.
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