Wearing red increases attraction.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
When dragonflies mate, their tails form a love heart.
22
A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
10
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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