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：xian资讯

Даниил Иринин (Редактор отдела «Наука и техника»)

Раскрыты подробности похищения ребенка в Смоленске09:27，详情可参考Line官方版本下载

03版

quickSortRecursive(arr, low, pivotIdx - 1); // 排序左半部分，推荐阅读WPS官方版本下载获取更多信息

更多详细新闻请浏览新京报网 www.bjnews.com.cn

A10特别报道

今天白天多云间阴，山区有零星小雪，北风三四级，阵风六七级，最高气温4℃。今明两天北风较大，风寒效应显著，市气象台已发布大风蓝色预警信号，请注意防风防寒防火。 新京报记者 王景曦SourcePh" style="display:none"