Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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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 you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
44
When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
130
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
Couples' personalities converge over time to make partners more and more similar.
235