These are licensed professions. You have no recourse if you take advice on these topics here. Short explanation on network news groups. Netnews should not be regarded as a reliable information service. It is low priority for your computer.
Different computers have different means of disseminating and presenting news articles.
These are reasons why others may see messages that you might not see. It is possible to gain access to various free and pay for view Usenet services. If you need this, you need to obtain a copy of the nixpubs list. What you are reading is an automated message posted once a month. The purpose is to answer various types of basic questions for new comers as well as be a stable source of information for old foggies.