1 Art, architecture, and archaeology
2 Biology and medicine
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30 Wikipedia-related
Look in the lower left margin of the page for other languages this is available in.
David, the spreadsheet is one of the best hidden secrets of LingQ If you not able to edit the sheet ask Steve for permission.
Additional I created some Google documents with helpful Links for German sources. Marianne did the same for French. You find the links on our profiles. I try to add all intersting links to my documents.
I think it should be to find here in LingQ, not in the Wiki. I’m afraid that all the new ideas will become one of the hidden secrets of LingQ if they are not presented more obvious. The link in the help is fine but not obvious. I think the start page or the community page should provide links to the Wiki, the spreadsheet, the Youtube Group, Marianne’s documents, my documents and so forth.