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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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A man's beard grows fastest when he anticipates sex.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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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.
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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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