The link to the rss feed has changed
Since the update of the website yesterday be aware that the link of the rss feed of the blog has changed. The new url is https://wyssmann.com/blog/index.xml. You can also simply click on the rss icon on the upper right:
You can also subscribe to other section of the page using https://wyssmann.com/<SECTION>/index.xml e.g. https://wyssmann.com/projects/index.xml