Baedeker modern Baedekers under the catchphrase ""Wissen öffnet Welten"" ("Knowledge opens worlds"). The previous German editions had four main sections: "Background", "Tours", "Destinations from A to Z" and "Practical Information from A to Z". MairDumont added a fifth section in each guidebook entitled ""Erleben und Geniessen"" ("Experience and Enjoy"). These new Baedeker guides were the first such guidebooks to incorporate infographics. From the outset, Karl Baedeker recognised the importance of publishing his guides in English as well. His son Ernst had worked in London before joining Verlag Baedeker in 1859, and was entrusted with the task of preparing the first Baedeker
Karl Baedeker (scientist) This was the first example of doping a semiconductor to change its properties and also the discovery of transparent conductive materials. He also observed a Hall effect in transparent copper iodide thin films that had the reverse sign to that in copper, an observation of what was later to be known as conduction by electron holes in semiconductors. This observation was critical in developing the theory of electron conduction in solids. Along with his graduate student Karl Steinberg, Baedeker studied the effect of varying concentration of iodine on the electrical properties of copper iodide. He also is credited with making