Baedeker Blitz for the German Foreign Office, is reported to have said on 24 April 1942, "We shall go out and bomb every building in Britain marked with three stars in the Baedeker Guide", a reference to the popular travel guides of that name. Goebbels was furious; keen to brand British attacks as "terror bombing", he was equally keen to designate German efforts as "retaliatory measures". Stumm's off-the-cuff remark "effectively admitted the Germans were targetting cultural and historic targets, just what the German leadership did not want to do, and Goebbels took steps to make sure it did not happen again". The
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