Nearly all information on this site comes from online sources researched and written by Perplexity, an AI application. All information is obtained from sources identified in each article in one of two formats. The default format is one or more digits following the relevant paragraph, each of which is a link which can be seen by hovering the cursor over the individual digit. A second format which I have been using recently shows the URL (link) at the bottom of the article. Each is numbered to match a number at the end of the relevant paragraph. This way, the source link can be seen at a glance.