When dragonflies mate, their tails form a love heart.
22
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
456
The single biggest predictor of love is proximity.
30
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Wearing red increases attraction.
30