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：tutorial资讯

At least 15 people have been killed and others injured after a Bolivian air force cargo plane crashed in the western city of El Alto, the country's authorities say.

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光伏巨头晶科能源12年来首次亏损