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：user资讯

Second, Reddit has gained ranking position for commercial "best X" keywords that historically belonged to these publications. In a separate analysis, we found anonymous Reddit posts ranking in the top 3 for keywords like "best screen recorders," "best free VPN," and "best wireless earbuds under $200."

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