Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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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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Wearing red increases attraction.
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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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Men who kiss their wives in the morning live five years longer than those who don't.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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One in five long-term love relationships began with one or both partners being involved with others.
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