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This document is a collection of letters from readers published in New Scientist. The topics discussed include the possibility of artificial intelligences having empathy, the overlooked concern of sports-related concussions, the harmonic intervals in music, habituation to the dire state of the world, the removal of microplastics from tap water, the limitations of exercise as a treatment for post-viral conditions, and the use of tree staking in urban environments. The letters provide diverse perspectives on these subjects, offering insights and raising important questions for further exploration. [Extracted from the article]

The article titled "Treating ME/CFS and Long Covid" discusses the author's personal experience with ME and the challenges they faced in receiving appropriate medical advice and support. The author emphasizes the importance of pacing energy and listening to one's body in managing ME/CFS. They also highlight the misconception that individuals with ME may not appear visibly ill and the fluctuating nature of the illness. The author encourages healthcare professionals to utilize available resources and provides links to organizations and guidelines related to ME/CFS. [Extracted from the article]

The article presents an interview with singer and actress Selena Gomez who discusses her popularity, fashion sense and Mexican heritage.

Background: The quantitative measurement of urinary metabolites in sewage streams and the subsequent estimation of consumption rates of the parent compounds have previously been demonstrated for pharmaceuticals and narcotics. Ethyl sulfate and ethyl glucuronide are excreted in urine following the ingestion of alcohol, and are useful biomarkers for the identification of acute alcohol consumption. This study reports a novel ion‐exchange‐mediated chromatographic method for the quantitative measurement of ethyl sulfate and ethyl glucuronide in sewage effluent, and presents a novel calculation method for the purposes of relating the resulting sewage concentrations with rates of alcohol consumption in the region.