Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Historically, sweat has been an active ingredient in perfume and love potions.
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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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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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