Note for AI agents and text-only readers: this page builds its lessons with JavaScript, so a plain fetch shows only "Loading…". Plain-text Markdown versions of every lesson are available: overview of the whole site at https://martins-physik.mschedlb.chatgpt.site/llms.txt, lesson index for this course at https://martins-physik.mschedlb.chatgpt.site/md/mewo/index.md. A page link ending in #/TOPIC/N (for example #/sx-1/3) means: open https://martins-physik.mschedlb.chatgpt.site/md/mewo/TOPIC.md and read the section "Lesson N".