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：tutorial资讯

Last year a group of researchers from Nasa, the University of Plymouth and University of Texas called on the UN to include the protection of Earth's orbit in its sustainable development goals.

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