Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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40% of people who are rejected in romantic love slip into clinical depression.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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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.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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