Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Dolphins have names for one another.
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When cats are happy, they may squeeze their eyes shut.
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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
10
Some British police cars carry a teddy bear to console children after an accident.
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