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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But while group chats have exploded in popularity because of their informality, that also creates its own challenges: Discussions can veer off topic, repetitive or basic questions can irritate group members, and that viral meme you think is funny could also offend.

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09:25, 28 февраля 2026Мир