Couples' personalities converge over time to make partners more and more similar.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
212
Two in five people in the world marry their first love.
270
Men who kiss their wives in the morning live five years longer than those who don't.
1k
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
41
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
27