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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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When dragonflies mate, their tails form a love heart.
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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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Men fall in love faster than women do.
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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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