Your letters.

This document is a collection of letters from readers published in New Scientist. The letters cover a range of topics, including personal experiences with glucose monitors, theories of everything and abstract geometry, the origins of asteroids, exercise therapy for long covid, the limitations of ancient Greek engineering, the mystery of consciousness, brain changes when playing musical instruments, the impact of climate change on extreme weather events, the subjective nature of tedious tasks, the importance of cars in rural areas, and contact information for submitting letters to the magazine. [Extracted from the article]