There are 3000 + posts on the HB. Some of them contain dead links, i.e., links that go to a site that no longer exists or that has moved. When I find them I try to fix them but I probably won’t fix all of them and some of them cannot be fixed because the material is not online any longer. Sic transit gloria webei. The good news is that when you come a dead link to the old HB (1.0), you can find that same material on the HB 2.0. You might have to use the search function or even Google site search (site:heidelblog.net search term) but it’s probably here somewhere.