Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Two in five people in the world marry their first love.
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Raj from the Big Bang Theory is married to Miss India.
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Historically, sweat has been an active ingredient in perfume and love potions.
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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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You burn 26 calories in a one minute kiss.
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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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