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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"The best training I ever had for being a commander was being a parent - because you have to learn how to say no to people."

Scientists warn that the debris is congesting space and threatens collision with rockets, the International Space Station, and our planet.，详情可参考一键获取谷歌浏览器下载

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