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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Men fall in love faster than women do.
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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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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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Wearing red increases attraction.
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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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