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
A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
10
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
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
The single biggest predictor of love is proximity.
30
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
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81