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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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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Two in five people in the world marry their first love.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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The sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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