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：cloud资讯

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Elon Musk's SpaceX company has a contract to build the lander - which will be flown to the Moon on a SpaceX Starship rocket. But delays to the Starship rocket have led Nasa to ask SpaceX for a new streamlined plan to speed a return to the Moon.