Couples' personalities converge over time to make partners more and more similar.
235
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
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
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
The average person will go on a date at least 100 times before they finally marry.
33
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
Men who kiss their wives in the morning live five years longer than those who don't.
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