Sorry, I had been assuming that the HN readership would assume that double checking tertiary sources involves consulting (at least) secondary sources, secondary

Sorry, I had been assuming that the HN readership would assume that double checking tertiary sources involves consulting (at least) secondary sources, secondary sources primary, etc. Just as well-founded loop variants help avoid nontermination, making strictly closer-to-ground double checks helps avoid echo chambers. (and frankly, "do your own research", to me, is a clear sibboleth translating to "enter our echo chamber")