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：study资讯

本报北京2月26日电 （记者彭波）十四届全国人大常委会第六十三次委员长会议26日下午在北京人民大会堂举行。赵乐际委员长主持。

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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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Ambient Dr

It's taken from the inside of the furnace, and shows plasma - gas heated to about 1,000C - glowing brightly.