We are organizing our lives in environments and by social and technological habits which are possible only starting with a certain moment: that moment when something which didn’t exist was invented, or something which was not even imaginable became real. Although progress (or emancipation) is the result of collective and often unseen effort, it is important to emphasize also the persons, situations or objects which created a threshold, starting with which things are never the same again. In selecting these moments I start both from the general mood (including news) around me and from personal interests.