In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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The left ear is more responsive to words of love and emotion whispered into it than the right.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Parents receive 1 out of every 5 Valentines.
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Couples' personalities converge over time to make partners more and more similar.
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