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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It all began last December when WBD agreed to sell its Warner Bros. studio and HBO Max streaming service to the streaming giant Netflix. Days later, Paramount Skydance lobbed in a hostile bid to buy all of WBD. Amid multiple twists and turns—and the CEOs of both bidding companies separately visiting President Trump to make their cases—WBD declared on Feb. 26 that it would agree to Paramount’s bid, which had gone through various permutations to make it more appealing. Netflix co-CEO Ted Sarandos declined to sweeten the offer, saying that for Netflix the deal had always been nice-to-have, not need-to-have.

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Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.

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26-летний Габриэль Вон 16 февраля отправился с группой в сплав по реке Иллинойс в штате Орегон. Он сообщил товарищам, что пойдет в лес, но вскоре вернется, однако после этого перестал выходить на связь.