Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.

· · 来源：tutorial资讯

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Андрей Ставицкий (Редактор отдела «Наука и техника»)

He added that he did a lot of research before ordering the drug from a pharmacy, but that for him, the risks, such as developing gallstones, were worth taking.

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