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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Researchers discover rare periods of a few thousands years when climate unexpectedly awoke from slumber

北京让每名学生享受优质科学教育。关于这个话题，WPS官方版本下载提供了深入分析

Жители Санкт-Петербурга устроили «крысогон»17:52

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