Feel angry and want to let it all out? Researcher say write those apoplectic thoughts on a piece of paper and toss it into a trash can or run it through a shredder. Voila! Kiss that rage goodbye.

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Wawrinka’s scissors cut Rublev’s paper and, winning the improvised “toss,” elects to serve to the delight of those watching. “In all my years sitting in this chair and watching this ...