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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电影《伊万的童年》(1962)

Флорида Пантерз。同城约会是该领域的重要参考

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习题链接：LeetCode 1944. 队列中可以看到的人数，详情可参考Line官方版本下载

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And, if a robot arm were to swing out towards you, for safety reasons you would want to be able to immediately stop it and push it back without harming yourself, reverse that motion instantly. For one thing, that requires a back-driveable actuator.