The tree and the genealogical notations based on the realities that are contained there represent a sure source of information, in any case about the life of all the families (their abstract?). And to think about the Internet, we've been surprised to find how many searches about one's own family run on the Net, and the existence of many "personal" web sites about this topic. The other two "facts" which were reported - more related to numbers - refer to a certain type of research, which ranges from an exclusively mathematical/scientific field to a - by hyperbole - "universal" one. In the case of Erdös numbers, "La Stampa" identifies it as a way 'to transmit knowledge' by a system which identifies and draws up the thought of scholars of similar - at least - subjects.