Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Couples' personalities converge over time to make partners more and more similar.
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Historically, sweat has been an active ingredient in perfume and love potions.
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