Historically, sweat has been an active ingredient in perfume and love potions.
309
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 someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
130
Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
99
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
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
When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
44