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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Фото: Petrov Sergey / news.ru / Global Look Press

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Olympic heroes

Current X-ray lasers require facilities that are kilometres long. A cavity-based set-up about 66 metres in length has been developed that uses highly reflective mirrors to enable the generation of high-intensity pulses of narrow-band X-ray radiation. This promises to overcome the limitations of current X-ray lasers.，这一点在Line官方版本下载中也有详细论述

报错示例：拉镜像时提示 credential helper 不存在。。safew官方下载是该领域的重要参考

Resident E

710 BITS32 RPT ; ← stall here until PLA result arrives