'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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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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40% of people who are rejected in romantic love slip into clinical depression.
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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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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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