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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Couples' personalities converge over time to make partners more and more similar.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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'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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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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