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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·当然，即使没有被确诊患上PTSD的朋友也可以尝试多玩玩《俄罗斯方块》，根据这项研究显示其不断旋转的方块对于预防让人崩溃的“侵入性记忆”引发的包括抑郁症等都有着缓解阻止效果。