Couples' personalities converge over time to make partners more and more similar.
235
One in five long-term love relationships began with one or both partners being involved with others.
177
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.
28
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
Men who kiss their wives in the morning live five years longer than those who don't.
1k
40% of people who are rejected in romantic love slip into clinical depression.
72
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103