It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Couples' personalities converge over time to make partners more and more similar.
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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40% of people who are rejected in romantic love slip into clinical depression.
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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
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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12