It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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Men fall in love faster than women do.
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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.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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40% of people who are rejected in romantic love slip into clinical depression.
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