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Videos

Why the History of Valentine's Day Is So Complicated
What St. Valentine, an ancient Roman festival, and Geoffrey Chaucer all have in common.
Video: Encyclopædia Britannica, Inc.
The science behind romantic love and attraction
Examining the roles of various hormones as a person experiences love.
Video: © American Chemical Society (A Britannica Publishing Partner)

Images

Valentine
American valentine card, c. 1910.
© Photos.com/Getty Images