Couples' personalities converge over time to make partners more and more similar.
235
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
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 medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
456
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
One in five long-term love relationships began with one or both partners being involved with others.
177
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
Historically, sweat has been an active ingredient in perfume and love potions.
309