Rare Earth Oxides (REOs) are certainly an exiting group of elements, though often forgotten at the bottom of the periodic table. I got to work with the oxide of praseodymium during my doctoral studies and later on studied also films of the oxides of cerium, samarium, and terbium. I will try to add pieces to the lengthy story now and then when I find the time. Now the start is made...let's see how it will continue. Again, stay tuned. (June 2025)