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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潮白河畔另一隅，北京轨道交通22号线（平谷线）潮白大街站地下二层施工正酣。“目前河北段5个车站主体结构全部完成，6个区间全线贯通。”河北段建设单位项目负责人李宝国说，作为京冀首条跨省域城市轨道交通线路，北京轨道交通22号线（平谷线）通车后，廊坊市北三县将接入北京轨道交通网，融入首都“一小时交通圈”。

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동계 올림픽 ‘첫金’ 최가온, 오메가 올림픽에디션 시계 수령