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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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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The left ear is more responsive to words of love and emotion whispered into it than the right.
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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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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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The single biggest predictor of love is proximity.
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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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