Re: Oxygen!
There's some past history of posts here that you're missing. A certain individual is infamous here for consistently making authoratative posts that are easily shot down by pointing out simple math errors, physics misconceptions or lack of understanding of chemistry. The individual is, shall we say "stubborn" about accepting such corrections and blithely proceeds on to the next egregiously erroneous pronouncement.
It's not "a" mistake, we all make more than one. It's a body of unrelenting work.