Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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You burn 26 calories in a one minute kiss.
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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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Parents receive 1 out of every 5 Valentines.
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