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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In 1999, a fisherman found a love letter in a bottle from a soldier in WWI. He returned said letter to the now deceased widows 86 year old daughter.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Speed dating was invented by a Rabbi in 1999.
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