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：study资讯

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Трамп высказался о непростом решении по Ирану09:14，这一点在同城约会中也有详细论述

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The mission was Nasa's greatest failure and, without question, its finest hour.