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:user资讯

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国务院核安全监督管理部门、核工业主管部门在各自职责范围内对原子能研究、开发和利用活动实施核安全监管。

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A planetary parade, which occurs when several planets appear to align on one side of the Sun from Earth's perspective, will be visible in the UK again from sunset on Saturday.