Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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The left ear is more responsive to words of love and emotion whispered into it than the right.
40
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
Men fall in love faster than women do.
32
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
26
If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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