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.

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深藏功与名公开资料显示,刘建军出生于1965年8月,毕业于东北财经大学国民经济学专业,获得研究生学历、高级经济师职称。

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