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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
634
Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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40% of people who are rejected in romantic love slip into clinical depression.
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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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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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Couples' personalities converge over time to make partners more and more similar.
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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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