When dragonflies mate, their tails form a love heart.
22
Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
26
A man's beard grows fastest when he anticipates sex.
239
The single biggest predictor of love is proximity.
30
Couples' personalities converge over time to make partners more and more similar.
235
Parents receive 1 out of every 5 Valentines.
20
In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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