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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Mathematical animations for the web.

The first part of Bridgerton's fourth season left us on cliffhanger worthy of throwing glassware, with three little words hanging in the air: "Be my mistress." And they'll stay there, stitched into the hem of Part 2, which continues the season's trials, trysts, and tribulations, and moves into more serious territory (don't worry, it's still Bridgerton, not Hamnet).

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Now celebrating its 75th anniversary, Twig's story began in a Tokyo hospital bed where Floyd Hartwig was recuperating after being shot in both legs during the Korean War.