Some words about comments on this site. You might be wondering that there are nearly no comments at all on the site. The reason for this is very simple. I approve comments only from people I know. I do not want my readers to be spammed. In the case you think your comment should appear on this site, even while I do not know you, send me an email, so we can discuss on the topic. There is a good chance to convince me about approving your comment.