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
Historically, sweat has been an active ingredient in perfume and love potions.
309
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
Couples' personalities converge over time to make partners more and more similar.
235
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
69
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