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This document is a collection of letters from readers published in New Scientist. The topics discussed include the potential implications of living in a simulation, the allocation of funds for space exploration, strategies for driving more efficiently, the unique aspects of human cognition, the role of AI chatbots, the rise in mental health issues among young people, the realism of quantum mechanics, and the layout of stores like IKEA. The letters offer diverse perspectives and raise thought-provoking questions on these subjects. [Extracted from the article]

This document is a collection of letters from readers published in New Scientist. The letters cover a range of topics, including the urgency of addressing climate change, the concept of time in quantum mechanics, salt addiction, artificial intelligence, the use of milk as a plant fertilizer, the benefits of wooden buildings, global food insecurity, carbon offsetting, and the disposal of waste in volcanoes. The letters provide diverse perspectives on these subjects and offer insights into various scientific and societal issues. [Extracted from the article]

This article is a collection of letters from readers discussing various topics. One reader argues that if our experience of reality is a simulation, then the "self" must be part of the simulation. Another reader suggests that theories like quantum mechanics and wave mechanics may not provide useful information about fundamental reality. Another letter discusses the concept of eco-anxiety and its connection to climate change. One reader proposes that parental overuse of smartphones, rather than children's use, may contribute to increased anxiety in young people. Other letters explore the benefits of solitude, the role of language in human childhood, and the different theories of reality. Lastly, there are letters discussing the challenges and potential solutions related to falling birth rates and an aging population. [Extracted from the article]

This document is a collection of letters from readers published in the New Scientist. The letters cover a range of topics, including climate change, extending human lifespans, navigation devices, geoengineering, the potential impact of a passing star on Earth, animal behavior, artificial intelligence, the true cost of products, and car culture. The letters provide diverse perspectives on these subjects, offering insights and raising questions for further exploration. [Extracted from the article]