There are times we (at least I) remember something we heard long time ago in part of our lives which is an historical fact, or better said, claim. However we cannot be sure whether the fact is actually accurate or a new-age invention (most of the stuff about mayan and incan culture floating everywhere is tainted by new-age) or another pseudo-science (which is OT here) topic. Perhaps we cannot even find a source right at the moment (perhaps we don't know how to word the search appropriately or, under our wording, nothing was found). So under this second case the question remains... unsourced.
Is this the appropriate site for questions like this? How do we distinguish in this case whether such questions are on-topic or they should be asked in skeptics.stackexchange.com?