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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Media Source Extensions™ — W3C Working Draft

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It comes a day after a SpaceX rocket blasted off from Florida carrying two privately constructed lunar landers and a micro rover to the Moon.，更多细节参见91视频

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