Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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A man's beard grows fastest when he anticipates sex.
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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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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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Historically, sweat has been an active ingredient in perfume and love potions.
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