In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Some British police cars carry a teddy bear to console children after an accident.
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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
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