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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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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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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Men fall in love faster than women do.
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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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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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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