For the one and only reason, which 20-year olds’ would pay attention to a 70-year old man’s words: ascertain whether the communication of living-dead is attainable.

By saying “The burden of lightness” I mean every real correspondence in concoctions of non-existent beings or circumstances, made for entertaining reasons. Such real correspondence for example, it was not Michelson’s and Morley’s experiment in 1887, to prove that there is the “Aether”. A long tradition was rejected like this, and it allowed the development of more appropriate theories on how the light travels in the space. The short talk will be limited in examples of real correspondences which are correspondences in the non-existent.