For over 45 years, I noticed again and again that many UFO sighting reports mentioned technical details, windows, strangely looking beings, and so on. From the critics' side, such details were almost always completely ignored. The sightings were then labeled as absolutely banal and ridiculous astronomical, atmospheric, physical, biological, chemical or comparable phenomena. Why were the important details completely ignored in so many cases? Why did they sweep essential factors under the rug so often? For what reasons did many governments remain silent on these topics, while at the same time financing expensive research projects on them? In this book, I want to examine these and some other explosive questions more closely and not ignore possible answers, even if they will not please some people!