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：dev资讯

The A Wall:* Calculating a 200-300km car route (or even shorter bicycle/pedestrian paths) could mean visiting over a million road segments, taking 10-20 seconds. For longer trips, this wait could become frustrating.

'I don't want him going abroad to die' says mum of son's assisted dying wish

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How dangerous is chickenpox?。51吃瓜对此有专业解读

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Fraudsters could theoretically attempt to pass off a different insect species as one of those four.