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
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
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.
27
8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
212
When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
130
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
A man's beard grows fastest when he anticipates sex.
239