Start school later, sleep longer, learn better: New study shows that flexible school start times can be an effective and practical approach to reducing chronic sleep deprivation and improving adolescents’ mental health and academic performance.

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Space & Astronomy

两汉至北朝近800年的风云变幻,在东魏北齐时代的邺城画上了一个句号,最终奠定了隋唐盛世的文化基因。

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