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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One in five long-term love relationships began with one or both partners being involved with others.
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Rex the German Shepherd was a rescue dog with a bad temper. He refused to be fed by humans and would attack strangers, but he’s a changed dog after falling in love with Geraldine the goose!
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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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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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Couples' personalities converge over time to make partners more and more similar.
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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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Two in five people in the world marry their first love.
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