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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things like the railroads and highways) caused all of these tasks to occur on

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Scientists say the findings are a warning about the kinds of chemical that people are exposed to in the environment.