In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Couples' personalities converge over time to make partners more and more similar.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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The average person will go on a date at least 100 times before they finally marry.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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