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:cache资讯

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How many men get prostate cancer?

失業率,这一点在快连下载安装中也有详细论述

arXivLabs: experimental projects with community collaborators,详情可参考同城约会

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dies aged 97

英伟达警告游戏GPU供应紧张,或预示涨价和缺货将至