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The letters in the New Scientist journal discuss the challenges of colonizing Mars, the preservation of Ernest Shackleton's ship Endurance in the Weddell Sea, the significance of the Bamboo Age, the early development of technologies without stone tools, the importance of soil health for future farming, different perspectives on myopia, a new way of viewing the moon, and the potential reasons why dogs may bite the faces of deceased owners. The letters cover a range of topics from scientific exploration to historical preservation and human behavior, offering diverse viewpoints and insights. [Extracted from the article]

This document is a collection of letters from readers published in the New Scientist journal. The letters cover a range of topics, including morality, the origins of Stonehenge, the impact of caffeine on different species, the problems with high-frequency trading, the mathematics behind artificial intelligence, the levels of reality in nature, and the climate impact of food production. The letters come from various locations in the UK and the US. [Extracted from the article]

This document is a collection of letters from readers published in New Scientist. The topics discussed include the need for artificial intelligence to have periods of enforced inactivity, the use of carbon dioxide levels as a gauge of climate change, the role of worms in leaf recycling, the potential problems caused by the collapse of oil states, the fragility of modern society, the search for alien life, the true cost of goods when emissions are factored in, the consequences of developing sentient robots, the potential for ordinary people to create fully functioning intelligences, the high rate of long covid in Switzerland, and the earliest recorded supernovae. [Extracted from the article]