The knowledge, indeed, is never for professionals only, and we know this well. Unfortunately, in a research project the lexicon is involuntarily selective, the topics already require basic notions that we cannot provide here, therefore we are sorry if it cannot be fully appreciated by all readers; in presence of voluntary contributors who could allow it, however, it is our commitment to work also in the direction of providing an easier information to a wider audience too, other than the specialists of this very particular sector.