Couples' personalities converge over time to make partners more and more similar.
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
26
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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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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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39