Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Some British police cars carry a teddy bear to console children after an accident.
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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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When cats are happy, they may squeeze their eyes shut.
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A group of pugs is called a grumble.
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